I've contributed a patch to repo.or.cz to allow darcs imports, but and I recently got a reply for it from the maintainer. So we worked together a bit more and now the patches are in, repo.or.cz just imported the source of darcsweb.
I also created a test project and tested that incremental imports work properly as well. \o/
NB: It uses my darcs-fast-export tool, that's why I started to work on this. ;)