Was that necessary?

As I said to billybob, when I work in cvs or Subversion, my team is working on a branch. Personally, I work on a branch of that branch. I check in anytime I like. When I want my teammates to receive my code, I merge back to the team branch. So, I don't really get the 'sandbox' advantage of git.

Speed and disk space have never been an issue for me with cvs or Subversion. The content-tracking sounds interesting, but really, I don't rename files all that often.

it has a killer app in GitHub

That doesn't have any sway on my choice of version control. I sometimes retrieve files from GitHub, but that's about it.

I don't know, I haven't heard anything really compelling about git. People who use it seem really excited about it, but not for any reasons that strike me as particularly objective.