As I'm not working today due to It being a bank holiday I thought I'd start on some games that I've yet to play. I was quite surprised by how many games I've not even started or only played for about an hour I found that I have only played a tiny amount of the following games,

Okami (Wii)

Conduit 2 (Wii)

Donkey Kong Country Returns (Wii)

Not a big list there admitadly but I haven't even opened the following games

Xenoblade Chronicles (Wii)

Call of Duty Black Ops (Wii)

Call of Duty Modern Warfare 2 (Xbox)

Halo combat Evolved Aniversary (Xbox)

Resident Evil 5 Gold (Xbox)

Resident Evil ORC (Xbox)

Rogue Squadron 3 Rebel Strike (GameCube)

International Super Star soccer 98 (N64)

Pro Evo 6 (Xbox)

Civilization 3 (PC)

Roller Coaster Tycoon 2 (PC)

Civilization 4 (PC) .....mainly due to my PC being too old to play it.

Over G fighters (Xbox)

That's all I could find at the mo. So is this a big list? Do others have a similar sized back log that you've let to play? Post your back log....

Starcraft II (PC)
Bioshock (PS3)
Uncharted 2 & 3 (PS3)
Mario Galaxy 2 (Wii)
Diablo III (PC)

quite a few unfortunately....

Tomb Raider: Underworld
Fallout 3
Dragon Age: Origins
Eternal Sonata
Batman Arkham Asylum

Yeah I have started almost all of my games. I have only finished about 67% of them.... (And dropping)

I'm about 12 hours into fallout 3, so I've got quite a bit to still play. Need to finish L.A. Noire and Dead island, though I probably won't. That's about it really since I usually buy games if I know I want to and will play them in at least a couple days after it being bought. So while I don't have Skyrim and SSX yet, I'm planning to buy them over summer and I guess they could be considered as part of my back log.

Repurhcase cause somebody stole them and when i find out who did it i'll kill them:
Dantes Inferno
Brutal Legend
Demon Souls

i have to long a list of games i've yet to purchase so i'll make this short:
Dark Souls
MNR
Mafia2
Batman:AC
God of War3

PS3/PSN
1. Red Dead Redemption
2. Mass Effect 3
3. Dead Space Extraction
4. Tomb Raider Underworld
5. Closure
6. Shank 2
7. Costume Quest
8. Rochard
9. Scott Pilgrim
10. Dead Nation
11. Sonic the Hedgehog 4: Episode 1
12: Back to the Future: Episodes 1 - 5
13. Trine 2

PC:
1. Amnesia: Dark Descent
2. Splinter Cell: Conviction
3. Metro: 2033
4. STALKER: Shadow of Chernobyl

Those are the ones I can remember, I think I have a few more. Also, many of them are PSN titles. I got several of them for free from PSN Plus. I need to quit my job, leave my lady, cut all my friends out, flush my life down a toilet, find a cave with an electrical socket and wifi, and gaaaaaaaaaaaaaaaaaaaaaame! This backlog is a pain cause there are tons of games I want to play but will probably pass on (unless otherwise compelled) because of this back log, like Twisted Metal, Starhawk, Max Payne 3.

This whole "having a life" thing is overrated!

Just going to list the retail games. Things get bit messy and long if i include steam/psn games :)

1. God of War Collection
2. Ratchet: Tools of Destruction
3. Vanquish (Playing)
4. Ratchet: Quest for Booty
5. Ratchet: Crack in Time
6. Fallout 3
7. Katamari Forever
8. Tekken 6
9. Nier
10. Valkyria Chronicles
11. Bioshock
12. God of War 3
13. Fight Night Round 4
14. Ico Collection

So yea quite a bit. Keeping purchases low this year and slowly catching up.  Just finished Red Dead SP. What an amazing game. Will get to Undead Nightmare soon. 

Not a very long list fortunately:

Games that I got bored of/thought they were shite:
Medal of Honor: Airborne
Metro 2033
Braid
Super Meat Boy
Ghost Trick: Phantom Detective

Other reason:
Duke Nukem Forever - I can't live in a world where this game isn't delayed, so if the devs won't delay it, then I'll delay it myself. Bought it on day one, it's still in shrinkwrap.

Half Life 2 Ep. 1&2 - Figured I'd wait till all episodes come out so I could play one full game rather than three short ones. So I got both episodes on Steam and am still waiting for the third one so I can actually start playing the first two.