Nope, I haven't moved it yet, so that'd odd.
I like the idea of moving techs and tilesets into their own project strictly for the sake of componentizing them, since you can really plug in any tileset and techtree that you want. However, there is no additional storage requirements on the server because subversion is very smart about that type of thing. When you create a new tag or branch, subversion only stores the information about each file and revision of that file, it never actually copies anything. In fact, the entire subversion repository on codemonger (including the FPM tree) only takes 101 MiB of disk space and contains all of the revision history for over a year.
So I'm using v1.5.5 on the server (I just upgraded from 1.5.4 yesterday). I like the idea of doing the svnsync thing, perhaps we'll continue to do our check-ins into codemonger and keep the sourceforge repository in sync? I'll have to read your links to figure that out, thanks!
EDIT: hmm, it would seem it might make more sense to do it the other way around? I'm not sure now