I just took the plunge and rooted. The first thing on my agenda is to rename a few bloatware .apk's, just because I can. Root explorer seems to be universally approved of around here, so I went to appbrain and purchased it. At this time, the process is stuck at "authorizing purchase." I've cancelled the download and re-initiated, but it keeps hanging here. Other apps are downloading just fine, so it's not a network problem.
Also, ever since I rooted, I've been getting network com errors while trying to purchase apps in the market. It happens using both appbrain and the stock app. I dont know if the network errors are unrelated to rooting, but I'm curious now.