2.0 Features:
-App Store
-Enterprise Support (Microsoft Exchange in email)
-MobileMe support (similar to .mac/check apple site for prices)
-better mail management
-contacts search (if you have many contacts, you can find a specific one faster)
-more languages (16, i think)
-reads MIcrosoft PowerPoint & iWork files
-Scientific calculator
I hope this helps. I can't wait for the iphone 3G! If you want more information, watch the keynote on apple.com/iphone
Price:
$9.95 (iPod Touch)
FREE (iPhone)
These are things that a 3G has that a V1 with 2.0 wont have:
better audio & headphone jack
looks cooler

faster browsing speeds (almost as fast as wifi)
GPS
$200 cheaper
will be availible in 70 countries worldwide (not all on July 11)