Much like my work with the Intel Core Duo mini, you can now read about the new Mac Pro (parts one, two, three) on macworld.com.
I spent the better part of a week poking around inside the machine, running benchmarks, playing with Rosetta and native apps, and testing games (both Rosetta and native). While not quite as in-depth as the piece on the mini, there's still a lot of content to be read.