Mac OS X Time Machine disks on Linux
Useful information about accessing a Mac OS X Time Machine backup disk on Linux: http://hints.macworld.com/article.php?story=20080623213342356
This information has proved very helpful over the last few days - although what I ended up doing was plugging the drive into a Mac and scp'ing the data across the network, since that was less hassle.
Looks like a good place for some Linux utility that provides a file browser for this kind of file system. Although I expect there's probably already one out there that I just didn't find yet.