My DOS favourites list at Abandonia (i own most of these but roughly 1/3 i added as favourites just to remind me to download/play them sometime..)
i used to save all my boxes, all the documentation, and even any plastic wrapping inside! =) now i just throw away all the packaging and throw the discs in a cd folder, or for the the most part these days i just buy on steam.
My experience with modern games is very limited, since i don't have much time. My fav games to play currently:
DoD (original online, Call of Duty DoD server 24/7 ava)
L4D (tho it's pretty dead since L4D2)
The Battlegrounds I and II (tho it's really hard to find anyone playing it)
The Specialists (with bots actually SO MUCH FUN)
Portal
Star wars Battlefront I and II (singleplayer but i still love it..)
Starcraft Origianl and New beta (both SP against comps)
Any Terminator game (mostly T3 rise of the machines (1st person shooter) Online flash-based stuff that is quite fun)
I don't own any console systems, or i should say, the most modern one i own is super nintendo. =)