I think these are all unused:

World Of Goo Steam Key
5ACQ7-88FLE-A46VJ

Crayon Physics Deluxe Steam Key
KER4E-P49JI-Q78K2
XTQ79-QF4KG-ZVW97

Superbrothers: Sword & Sworcery EP Steam Key
D3GC9-B09DI-JT0NT
Z4FEP-TM7NT-WJN6V

Machinarium Steam Key
IMNCH-WYL02-HAC09

Zen Bound 2 Steam Key
AL6MH-4E02N-K3TQB

Avadon: The Black Fortress Steam Key
JHNJX-7RJQV-N9FMB

Solar 2 Steam Key
XE7QL-MC5EA-JNGBJ

Splice Steam Key
8TBFY-NN3N5-2XRJA

Little Inferno
https://www.humblebundle.com/gift?key=fPGEKFbxey6tMC3q

FEZ
https://www.humblebundle.com/gift?key=hr8vmxpxy4br7tsV

Cortex Command Steam Key
YYL4J-TJTAL-IV7HI

Humble Indie Bundle #3 Steam Key
30JBP-4XHL6-FNG4T

Humble Indie Bundle #3 Desura Key
HIB3A-8DWFJ-YXRNR-NH2WY-HXCU6

Humble Indie Bundle #2 Desura Key
HIB3B-34YV9-905FF-KKDD5-GEGQC
00e434289a0e9c1ec80b4bb119b21197

Wizorb, BIT.TRIP.RUNNER, Gratuitous Space Battles, and Jamestown Steam Key
QAFG2-7F8LM-T6K0B

Cave Story+ Steam Key
F8E3I-3Y4N0-WD5Y8

Awesomenauts Steam Key
HC85D-9X2EW-BHECT

Awesomenauts Cluck Costume Steam Key
Q5GZ7-RY0J8-L8YDH

Oil Rush Steam Key
2BIOZNFLCAHJAU4X

Brütal Legend Steam Key
BLFQI-GAJBZ-3WBN4

FTL: Faster Than Light Steam Key
J9RHV-YHVK0-E74QR

LIMBO Steam Key
NH6L4-GX4IJ-5TZWW

Bastion Steam Key
DIC03-FVKG7-YLBPX

To the Moon
https://www.humblebundle.com/gift?key=vnwmA47VaVdtHkwG

HOARD
https://www.humblebundle.com/gift?key=qBdCPcuPUBCe7HBv

Humble Introversion Bundle Desura Key
INTRO-X3UVB-95FGZ-IADM1-NSLY1

Dungeons of Dredmor Desura Key
HW96D-APHHP-4JZSW-193CO-619Q4

Gish Steam Key
IK473-AH8D2-QC4DK

Darksiders Steam Key
7KFD8-C7BPT-3DT5Z

Deponia
https://www.humblebundle.com/gift?key=CKfUYVVphEEtRdTP

Time Gentlemen Please - Ben There, Dan That | Steam Key: 7V30Z-KIV2Y-459QK

I took the FTL key. I've been hearing great things about that one.

Many thanks!

I really enjoyed FTL.

I was completely addicted to FTL for a few months. Fantastic game. I still go back to it every few weeks. There's a new, free expansion pack due out pretty soon, too. I'm expecting to get hooked again.

It's incredibly well balanced. Initially I hated the way it forced me to rush through each level, instead of examining everything. Later I realised that was necessary, so that each time to you play through you get different crew and equipment, and have to adapt your overall strategy to fit.

I took Oil Rush, and thanks!

I took HOARD, thanks for sharing!

Mafia 2
EIKBA-K0F0A-P00KE

Trine 2
6RA2G-H9K5B-MYDTT

Faster Than Light
NXADY-4QQPA-ELQDZ

LIMBO
YHW7B-DKNRC-GDMIE

Bastion
ENIHC-HPR29-FPC3G

Thanks for Trine 2.

First up:

Proteus Steam Key
PXJCE-LE7JR-9C6FY

Capsized Steam Key
90W6R-2E60L-QADZT

Snaked, thanks heaps.

Dear Esther
DPM4E-C8XG5-QVE7V

please comment if you claim one :)

This is pretty awesome of you!

Capsized Steam Key
90W6R-2E60L-QADZT

oops double post ;)

Thomas Was Alone Steam Key
MHQKH-3K7J8-V50DP

Thank you for Thomas Was Alone. I shall contribute with one of my own

English Country Tune Steam Key
43AKQ-MNIEQ-DCZBF

Oil Rush Steam Key
TE6CJGIMSMWHPPFP

that's all from HB 8, HB 9 next

I might take this one too if it's still here in the morning.

If not, I have a spare in the comment below.

My daughter thanks you very much for Dear Esther. :^)

HB 9:

Eets Munchies Steam Key
563D-E7NW-BZU8-RATF

FEZ
I76GX-9Q33Y-G5602

Thanks for this one! Been meaning to try it out

Rocketbirds: Hardboiled Chicken Steam Key
VF3C5-8BE0F-8Q7XH

youre the awesome. thank you

I'm not sure if this works as my Portal 2 PS3 I bought was used, but here goes...

CAT80-TXDLC-KQ4G3

Let me know if it works?

Looks like it has to be registered through a PS3. Can't register it through your Mac/PC.

I hope I haven't screwed it up for anyone with a PS3 who is interested. I Canceled the registration, so hopefully the number is still available.

Thanks, anyway!

A Virus Named TOM Steam Key
AFZ55-HNZQ0-V6IQC

LIMBO Steam Key
GT289-6Q0GP-9ZI3B

Bastion Steam Key
J2CWH-E3FYJ-45KCH

HB WB bundle now, I think this was when they introduced gift links rather than handing out steam keys. Anyway, I think you'll have to sign in through steam on their site to claim it, if you've got the steam guard thing running then you'll have to authorize the site with a code they send you before it can activate your game. It's a hassle :-(

Fear:
https://www.humblebundle.com/gift?key=wnNE27zUUHryFb7d

Fear 2:
https://www.humblebundle.com/gift?key=hTYTAGEuwNZNwGHT

Fear 3:
https://www.humblebundle.com/gift?key=hAmR7Y3R6rWtYvfu

And some random DLC/packs for F2P games:

Guardians of Middle Earth & DLC:
https://www.humblebundle.com/gift?key=srA4DnCEHvzD2cKh
https://www.humblebundle.com/gift?key=BHmqmNYGTds4xZA2

Gotham City Impostors: Professional Kit
https://www.humblebundle.com/gift?key=afhrw8PXywpkmVaG

Batman Origins DLC
https://www.humblebundle.com/gift?key=NBfaC24SSht4ap4R

LOTRO: Steely Dawn pack
https://www.humblebundle.com/gift?key=ywZNFVCqFTwNs8Zz

I play LOTRO now and then, so I grabbed that pack. Thanks! :)

Thanks for Batman Origins

Alright, the last batch, from HB 11. More gift links :P

Guacamelee! Gold
https://www.humblebundle.com/gift?key=VpNv8duUCTd8Xqxp

FEZ (again)
https://www.humblebundle.com/gift?key=ENwXZTT8hAv2vSNW

Starseed Pilgrim
https://www.humblebundle.com/gift?key=uK3FWYe7kGpcyU2N

I grabbed the Starseed Pilgrim key. Thanks!

Took the guacamelee, thanks!

Beatbuddy:
https://www.humblebundle.com/gift?key=CEBk38xUnGfcDwbh

Monaco
https://www.humblebundle.com/gift?key=vmTS2y7a5YM3D856


Th-th-th-that's all folks!

PS:

I Loved:
Superbrothers: Sword & Sworcery EP
FTL: Faster Than Light Steam Key
Little Inferno
Braid
Thomas Was Alone
To the Moon

Didn't get on with:
Solar 2
Dear Esther

I've got 3 copies of Natural Selection 2 and one of Portal spare on steam.

Dunno what this steam key stuff is all about, but if you PM me an email I can apparently send them to you that way.

Thank you kindly!

Fez:
https://www.humblebundle.com/gift?key=yUGMDEnRctttxtXw

Batman Origins DLC:
https://www.humblebundle.com/gift?key=c2fMzkXet8BwnbSc

I would like to propose an idea.

Whenever we finish or get bored of these games, why not repost the code? This can be like netflix for games no?

Unless anybody knows different, once a code has been activated on a Steam Account, it can't be unactivated and re-used. So you would need to have one game per Steam account, and share the logon details. Most (but not all) of the Humble Bundle games are available for DRM-free download, so we could have a SE library. But, I dunno, it seems a bit against the spirit of Humble Bundle.

I've got these to throw into the pot as well:

World of Goo, Anomaly Warzone Earth, EDGE, Osmos (It's all or nothing for this key)
--- ELG8I-GX573-4H2R6
Greed (MAYBE REDEEMED)
--- GZ5BL-3C08G-GJKN5
Cortex Command
--- LCD6L-0VDP0-CIEC9
FEAR (https://www.humblebundle.com/gift?key=FVtAwG5NdcFneM8a)
FEAR2 (https://www.humblebundle.com/gift?key=KXFyWwxCWEfKPVh8)
FEAR3 (https://www.humblebundle.com/gift?key=AfEzX8XwXcXBTSHB)
Batman: Arkham Origins DLC (https://www.humblebundle.com/gift?key=efaC3yFfYbaNZ3Uc)
Mortal Kombat Kollection (https://www.humblebundle.com/gift?key=Z27duGU5yYAV3SmW)
LOTR Online Steely Dawn Starter Pack (https://www.humblebundle.com/gift?key=FA835SGW4a8kmqwn)