I like collecting live audience recordings of my favorite bands. The computer and internet access I have anyway, so it's cheap to hunt for recordings and download them.
Favorite artists are Prince, Steely Dan, Tower of Power, Deerhoof, Mike Watt, and Zeppelin/Floyd of course.
And the best part is I get to listen to them while I organise it all and make/find custom album art and such. There's something about organizing stuff...