I'd like to start a thread about those odd little programs we personally like, and are worth recommending.
They don't have to be particularly useful, quirky or fun will do.
I'll start off with Picture and Soundshow. I've been using this application for several years now. It's a screensaver application which allows you to make slideshows with music. It has a lot of nice options, and you can even create stand alone savers to share, which I find useful for things like family photos.
Further information here:
http://www.joeltechnologies.com/