I just received news that a git adapter will be included in the next release of the Ruby-based Capistrano webapp deployment system.
http://dev.rubyonrails.org/ticket/9635
http://capify.org/
I'm using the patch right now and it works well. If you use Capistrano, you now have one more reason to switch to git!
-- Geoffrey Grosenbach http://peepcode.com