I have tried TurnKey Linux Revision Control appliance and it has gitweb cgi as web interface.
I am looking for appliance similar to turnkey linux that has git and gitorious as web web interface. The deployment of gitorious (e.g.: Setting up Gitorious on your own server) is not an easy job.
There is a long thread on the Turnkey Linux forum with patches for creating your own appliance.
The Gitorious team also sells one for $5,000 for the first year and $2,500 each following year.