Two quick hits: first, by popular request, I've started a web-forum for Savant at http://phpsavant.com/forum; it uses Vanilla. Second, because of a recent spate of spam attacks on my blog comments (1000 or more per day), I've activated Akismet; in 24 hours it has captured 3900 spam comments and trackbacks. Makes life a lot easier, although it'd be nice if that was the default spam-catcher for Wordpress.
Are you stuck with a legacy PHP application? You should buy my book because it gives you a step-by-step guide to improving you codebase, all while keeping it running the whole time.