Thanks for the link to "Mover". I'll have to give it a try at some point.
I've been using muCommander for a while now, on and off, but I don't really like it because it's got no search facility. It does "punch through" all of the normal file visibility rules that OSX Finder uses though so it's useful every now and again (if you already know where to look for stuff).
[Aside: I remember using Norton Commander but preferred PC BOSS. Come to think of it I might still have a copy of that somewhere if I looked hard enough.]
A while ago I wondered whether I should be using some kind of Subversion/Git repository for version control but a quick look at them told me that they're probably too complicated for my simple needs.
I'm still open to suggestions though, even though we're quite off topic now - sorry rascalsmom.