Running your own internal git server can have several advantages. Mainly, you are not sharing your code (IP) with external parties. There are many frontends you can strap onto a git server too, like Gitlab, Gitweb, Gerrit, and cgit [1, 2, 3, 4]. We use git/gitolite/gitweb heavily with our internal puppet infrastruture. You can have pre/post commit hooks for things like, syntax checking, email notification, and code deployments.

Here is the workflow:

          +--------+   +---------+
          | gitweb |   |dashboard|
  staff   +--------+   +---------+  nodes
   +-+          |           |        +-+
   +-+-\        |           |      > +-+
        \ +--+-----+     +------+-/
          |  |git  |     |puppet|
   +-+ -->|  |gito-| +-> |master| -> +-+
   +-+    |  | lite|     |      |    +-+
        / +--+-----+     +------+-
       /   |    |                 \
   +-+-    |    v                  > +-+
   +-+     |     email hook to       +-+
           |       staff if production branch
           v
            syntax hook

I created a screencast about running an internal git server with gitolite @ http://sysadmincasts.com/episodes/11-internal-git-server-wit...

[1] http://gitlab.org/

[2] https://git.wiki.kernel.org/index.php/Gitweb

[3] https://code.google.com/p/gerrit/

[4] http://git.zx2c4.com/cgit/