I just posted two new blog posts covering some useful git actions:

Using git to tag deploys and then using the “–contains” switch to determine the exact time & date a certain feature went live: http://blog.ragingstudios.com/2011/06/05/when-did-this-feature-go-live/

..and a collection of useful git commands and workflows, including Diffing Diff’s, common ancestors of commits or branches, recommitting a commit, viewing a file in another branch without actually checking it out - and more: http://blog.ragingstudios.com/2011/06/05/i-heart-git/