I'm lazy. I'm lazy, I use IGNs database. It's missing several of my Saturn games and I haven't been good about keping it up to date but it's fairly easy. ~Krelian P.S.: You can see an IGN list in my signature. P.P.S.: There is also VGRebirth.com but it's database has even FEWER games than IGN.
I am using my site (in my sig) for my list, but I am terribly lazy/busy* so it''s still hugely incomplete. *delete as applicable
Paper. Seriously, good old fashioned paper. I like tangible things, and so prefer being able to hold these lists in my hand. I still edit articles by hand as opposed to on the computer. Besides, I only need such lists for personal reference.
Me too. Paper rules, although I'm putting it all in a big word doc now so I can easily remove sold items etc.
I sometimes updated my collection/want/have list at UGTZ. http://gametz.com/user/GaijinPunch.html I've only made a few trades, so don't update it religiously, but it's pretty accurate. The best part is that they'll add games (any region) that they don't have in already.
I have gone away from using paper since I misplace the lists even though I put them in places I think I will remember later which results in a multitude of lists. I don't store the lists on my computer since I regularly take files off the computer to make room or to make folders less cluttered. For right now I use gamespot for my videogame lists and dvdaficionado for dvd lists.
I used good old notepad for everything, though I've just gotten lazy over the years and gave that up.