Come on do a little diagnostic test....try a different push app. Make sure your WiFi is on.blah blah blah. Report back after you have confirmed push in general isn't working. Double check the preferences to make sure oyu have it enabled.
try a different push app. Do oyu have mobile me? Just for ***** and giggles send it a message using find my ipad. Don't have an ipad sorry but i'm sure its working for most people. Probably a congestion thing too with everyone using their ipad.