Got mine back in 2002, and my very first game with it: Jak & Daxter. It's easily my favorite gameconsole, simply because of how many games I played on that thing. I think around 80% of my games library is PS2, and I've got more than a few (older) systems. Seriously, I have a big bag standing in my room, which contains around 40 PS2 games I've been meaning to sell or trade in, but never did.
Anyway, the fat old thing still works, which is a miracle on its own, considering how much dust must be inside of it by now. Let's just hope I haven't jinxed it just now...

Only the controllers are acting up, but that's to be expected after 8 years of (ab)use.
Favorite games.... would be Guilty Gear X2, Star Ocean 3, Soul Calibur 2, Jak & Daxter, Final Fantasy X, and probably a few I can't remember right now.
Happy anniversary, PS2! Here's to the awesome gaming moments you made possible.