What are some common and/or useful pre-commit hooks for SVN?
We have a post commit hook that posts the message to a twitter account. Uses twitsvn (disclaimer: I'm a committer on that project).
Silly? Maybe...but it turned out to be a good way for us to communicate the goings-on of our repository to some of our version-control-challenged team members. Once SVN started talking to them via their twitter client, it didn't feel so much like a black box.