Hi All,
I've been using XAMPP for many years, and always found the process of switching between local projects irritating.
I've written a small (8kb) windows app to allow you to change the current DocRoot in httpd.conf quickly and easily:
You can download it at http://archive.neonascent.net/307
Not sure if this has been done before, but this is my offering - Hope it's helpful!
Josh Harle
neonascent.net