I totally remember doing this mad buying at the end of last gen too. As 360 and PS3 came out, I was scouring Gamestops for Xbox, PS2 and Gamecube titles on their buy2get1free sale every week, or sometimes every few days.
I got into this list thing because I got obsessed with Allgame.com's database. I would spend hours scanning through their lists and then make my own. It got overwelming, so many interesting titles from every era of gaming, so I started rating them ala Netflix to make sense of it all.