As a Windows git user, this is a minor concern. msysgit works from cmd, powershell, and the include bash prompt, and the gitk and "git gui" tools are actually pretty good once you're familiar with the metaphors.

The one thing that still gives me the heebies is the CRLF handling, but I think that's because rails generates unix-style files, and I get a warning from git gui whenever I use those scripts.