I have just finished moving the entirety of this site to Mercurial, in two distinct repositories (one for code and one for page data and assorted media). The whole thing was pretty painless (mostly hg init; hg add .; hg commit with a few cleanups along the way), and I expect to do the same for Yaki to some degree.
Since Google Code uses Subversion, I will have to fiddle a bit with it to ensure that I can do day-to-day development in Mercurial and push out stable snapshots now and then – maybe I will tie Mercurial into Snakelets somehow and find a way for Yaki to literally publish its own repository (which would be cool), but only time will tell.
Additionally, the TextMate bundle for Mercurial (despite lacking the polish of its Subversion equivalent) has a very neat “Push to default repo” action that enables me to push changes to the site after testing and committing them locally, which is also a plus.
This will hopefully help me coordinate coding across my laptop and desktop, as well as making it far easier to backup stuff (I just ignore the top-level .hg directory, and that’s it).