I just bought Portal 2.  Each time I buy a new game, I think it will be a keeper.  When I decided to buy Portal 2, I traded-in Crysis 2.   I got a good deal for it.  But one week ago, when I finished the single player campaign, I never thought I would part with it.  And yet, here I am.  Crysisless.  Looking at my collection, I wondered wich game will never be traded.  Here is my list, for the fun of it.  And, as always, I would be interested in knowing yours.

Batman Arkham Asylum, Fallout New Vegas, Dead Space 2, Divinity II the dragon knight saga, Dragon Age Ultimate edition, Bioshock 1 and 2, Portal 2, Alan Wake, Enslaved, Tron Evolution and the Ultimate Sith Edition of the Force Unleashed.

Well it used to be not much, but now I keep everything. I love my collection with around 75 PS3 games and 25 360 games.  I guess I am just fortunate enough to be able to afford this luxury

Mmm? You started gaming just with this generation or something? Recent titles, all of them!

Well, as for my collection... most of it :P

alot go back i find it hard to find games that are really good for me to keep forever nowadays for me it certainly gets harder the older you get, when i was younger i would replay games alot but not as much now

i only replay if theres a specific achievement/trophy and keep games that have some type of value or meaning to me and or are part of a series like RE5 i'll never play RE5 again and didnt really like it much but because i like the older resident evils i must keep RE5 to go with the older games... so the older games dont feel lonely w/o there sequel

I am an trader, hate doing it because i want to play all those games now. But i have now got 14 PC games and 9 PS3 games from all ps3 and no PC. Probably because i cant trade PC games i wish i could get all those PS3 games back. I probably bought around 30 titles. But started disappearing when 4 = 1 title then 1 title = 0.5 of another. 

Portal 2 i say is an keeper. the Co-op would be great, the Custom levels will provide an weath of fun 

I am pretty happy Divinity II is in your list :)..

I don't really trade my games in or sell them...The last five years I only made an exception for two games;.

DQ VIII and UDF undiputed 2009 (That fighting game)  I bought them expensive and didn't enjoy them :s.  (and I wanted an other game but missed the finances).