I just found out today so I thought I should share it with you
How to take a screenshot on your iPad, iPhone or iPod touch?
Press at once "Home" and "Sleep/Wake".
The screen flashes white. Your device captures the entire screen and saves it as a photo.
Where do you find your screenshots?
In the Photos app.
You need firmware 2.0 or later.http://www.take-a-screenshot.org/
Now my question is, how do you attach those screenshots in a post (using the full site of Glu, not the mobile version) ? :-)