I have MUA , Full Auto 2, and Resistance, and just ordered Twisted Metal Black and Mortal Kombat Deadly Alliance. What other games would be good to get for the PS3 that 2 people can play together?

If you can find it War of the Monsters (http://ps2.ign.com/articles/382/382133p1.html) for the PS2 is a total blast. The single player is pretty shallow but 2-player mode is some of the most fun I've ever had on the PS2. Looks great and the controls are about perfect. It's made by the same team as the Twisted Metal series.

http://i43.photobucket.com/albums/e359/oddbodyAS2/ps2/warmonsters.jpg

http://i43.photobucket.com/albums/e359/oddbodyAS2/ps2/warmonsters_1.jpg

http://i43.photobucket.com/albums/e359/oddbodyAS2/ps2/warmonsters_08.jpg

Can you play two players with Blast Factor? I think that'd be a fun game to play with someone. Not sure if it's still available to buy, though.

I'll second War of the Monsters and add the following...

* Soul Calibur 2 - weapons fighting and one of the few games where you can get a few more hits in after your opponent is down!
* ANY of the Baldur's Gate series for great co-op play and storylines
* Guitar Hero II (requires two controllers for co-op)
* Any of the Burnout series

If you want fun co-op with kids - try Shrek 2.

For easy pick up and play sports games - the EA Sports "Street" series are fun (NBA Street, NFL Street and to a lesser extent, FIFA Street).

My family plays the PS2 Hot Shots Fore! together (three of us). We've played the PS3 demo of Everyone's Golf 5 and are planning to buy it when it comes out in the US. It's not exciting like a racing or action/fighting games, but we've had fun with it.

Gradius 5 for the PS2.