My favorite aliases:

st = status -sb (more compact status. Can always use the full word "status" if I want the normal one, but I don't think I've done that once since I set the alias. Not original, I found it online somewhere)

dfc = diff --cached

dfw = diff --word-diff

msg = commit --allow-empty -m (http://ozmm.org/posts/git_msg.html)