The Motorola Backflip featured a severely crippled version of Android that had Yahoo locked as the default search provider, the Google Experience apps were hidden in favor of AT&T bloatware, and the phone didn't allow third-party non-Android Market apps to be installed.
The Dell Aero (AT&T's next Android phone) was reported by those who got review copies to be very similar.
So, although the Samsung Galaxy S looks like the heir to the Android superphone throne (G1 -> Droid -> Nexus One -> Galaxy S), I'm a bit disappointed it's going to AT&T. And AT&T is my own carrier and I'm jonesing for an Android phone bad. But I'm not going to be buying one if it's a locked down iPhone-like experience.
I covered this work. I hate when people shill for their own crap on forums, so I won't link to it here.