Anyway, I've decided to keep some sort of track of what I'm installing and configuring on the machine to make it comfortable for me as a long-time Linux user. The main point of this is that if I have to start again from scratch for some reason, the whole process will be easier to repeat; however, there's a chance that some nugget of information here might be useful for somebody else in a similar situation.
The initial setup seemed pretty smooth, and I transferred across all of the files from my Windows box and my Linux box. Transferring the MP3 collection took a little longer, though—35Gb takes a while to move over a 10Mb LAN—so I left that running overnight.
The first thing I installed was the Xcode package package from the OS DVD-ROM that came with the machine, in preparation for some development activity.