Here’s what I just did with Darcs:

1. I had a library directory with a test/scratch application in a subdirectory.
2. I just pulled only the patches making up the addition of that subdirectory to new repository,
3. used darcs move to move the files into a nicer configuration,
4. and now that’s going to turn into the skeleton that will get Ludum Dare 26 jam content shoved into it once it starts, with all the revision information from the original part preserved.

Yes, yes, I know, nothing too spectacular ultimately, but I do really ❤ Darcs sometimes.