I decided it would probably be a good idea to start posting features we are missing based on the Full IOS5 update. Feel free to post here on what you have discovered isn't supported for your hardware.
1st Gen iPad:
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-Not able to purchase ringtones from iTunes store
-No Location aware reminders
-Multitouch Gestures, Including some that were supported in IOS4
-No Siri
1st Gen iPad:
---------------------------------
-Not able to purchase ringtones from iTunes store
-No Location aware reminders
-Multitouch Gestures, Including some that were supported in IOS4
-No Siri