With the current iPhone, you can only talk and surf (or do anything data-centric) if you are on a wifi network. On EDGE, it's one or the other. (If you are on a web page and get a call, whatever you've already downloaded is still there to be viewed, but no new data will come in until the call ends.) I believe that on 3G, you can talk and do data at the same time.
hehe...the host looks like he's conducting a symphony orchestra at the beginning. Move those hands just a little more!
So Apple has an iPhone 3G guided tour on their website...
http://www.apple.com/iphone/guidedtour/
I am at work and can't watch it...anyone want to take a look at it and let me know what it has...any new information?