Here are a bunch of git-related tools I've found useful at some point. The git repository for all of these is cloneable at git://gitorious.org/willgit/mainline.git/ (browse).

git-wtf: understand the current state of your git repository.
git-publish-branch: publish a branch to a remote repository.
git-rank-contributors: rank all authors by patch size.
git-show-merges: show which branches are merged into the current branch.
git-walkthrough-add: (deprecated) like git add -p.

The HTML source for my (i.e., this) web site lives in a Git repository on my local workstation. This page describes how I set things up so that I can make changes live by running just "git push web".

Strano allows you to run any capistrano task via a clean and simple web interface. Simply create a project from any of your Github repositories, and Strano will use the Capistrano configuration within the repository itself. Which means you don't have to set up Capistrano twice, and you can still run capistrano tasks from the command line without fear of different configurations being used, causing conflicted deploys.