Last year, I sold off some Magic: the Gathering "power cards" that were (1) worth a lot of money and (2) not so fun for friendly play, which is all I'm likely to ever do again with my Magic collection. Recently, I did a survey of some of my other game-related items to decide which ones are likely to never, ever be used. Decisions I made:
1) I'm keeping Space Hulk. It's a great game that I will introduce to y'all who haven't played it at some point in the future.
2) I'm keeping the Space Marines I've put together, pretty much for use with Space Hulk (there's an issue of White Dwarf Magazine with rules for normal Marines in Space Hulk).
3) I'm keeping all my Epic stuff. I will put together the things I have not yet assembled, Krylon coat all the metal pieces to keep them from oxidizing away, and try playing with the new Epic Armageddon rules set.
4) I'm really not going to do anything with other unused or partially used miniatures, so a whole chunk of nostalgia is going on the ebay auction block. We have:
The old Space Marines boxed set, fit to produce three squads (30 marines). This is a second one that I never assembled.
A bunch of old Chaos Space marines.
32 Eldar Harlequins. These actually saw a reasonable amount of play time, back in the day.
Marneus Calgar, a Space Marine diorama. So far, this is the only one not selling.
36 Melniboneans, including one or maybe two Elrics. Bought when I thought I was going to participate in a fantasy wargame campaign -- they were packaged as Elves, but they're Melniboneans.
The Last Starfighter Tunnel Chase game. Seriously.