I am not sure what T-Mobile's EDGE versus AT&T's speed is, but I use the internet on my BlackBerry all the time via T-Mobile's EDGE and I find it a little slow but more than useable. My parking garage is a few minutes walk from my office so I normally catch up on latest posts here and read the news on my cellphone. I've used my phone's browser to buy movie tickets and various things like that.
I've even tethered my BlackBerry to my PowerBook (via bluetooth), used it as a modem, and gotten ~20kps downloads. I've had to do that a few times when I was on a roadtrip and someone emailed me documents I had to work on for them.
3G is undoubtedly faster but, in my opinion, for random web browsing and stuff like that I think EDGE is okay. Faster is always better yes, but EDGE is not unusable. Far from it.
Did anyone notice that David Pogue played the
Operator Please video on YouTube.