Question

What are your favorite Git configuration settings which make your life easy while working with Git?

Answer 1

The aliases I mention in Trimming GIT Checkins (and the fixup! action from the recent Git1.7.0):

[alias]
    fixup = !sh -c 'git commit -m \"fixup! $(git log -1 --format='\\''%s'\\'' $@)\"' -
    squash = !sh -c 'git commit -m \"squash! $(git log -1 --format='\\''%s'\\'' $@)\"' 

, really help me to commit very often even though I am in the middle of one task, allowing me to finish it with one coherent commit at the end (instead of too many small intermediate commits).
Not exactly “fun”, but very useful.