SlideToPlay published several interesting videos where popular games are shown on the iPad in action. You can see games like Need for Speed Shift, Super Monkey Ball 2 and NOVA played on the big screen. Some of them are optimized for the bigger resolution, others are just a 2x bigger rendering of the exact same iPhone game you can buy now.

The titles of the first movie are Assassin's Creed, Sims 3, Tetris, and Paper Toss:

Here's the video of NOVA:

The movie Super Monkey Ball 2 and Need For Speed Shift:

Scrabble and Orbital: