Just looked at my list, it actually only has 485 games on it. I forgot that it includes a few games that got cancelled or moved to other consoles - e.g. Kameo, Giftpia, and Roll-o-Rama (remember that one?)
Edit - Ian: Allgame was awesome, my list is at 516 now...I can't believe how many I missed. What really surprised me is how many of them I knew, but forgot, there were maybe 3 I hadn't heard of before. Not that I missed anything really important, but I remember Dr. Muto and Black & Bruised being titles I was sort of interested in when they were released...and Universal Studios, how could I miss that? I mean, it's utter crap, but still, it's a pretty notorious game, and one of the few games released in 2001 (well if you count 20 as "few").