If you are a webcomic fan like me and wouldn't mind a strip from time to time disturbing a little your workflow, here is a little application I wrote up that might interest you.

I called it Zencomic. It simply displays a notification bubble with a random comic regularly. Everything is implemented as addins via Mono.Addins and currently you have a Dilbert addin and an xkcd addin coming with for free.

Screenie :

zencomic-screen

Tarball : http://netherilshade.free.fr/mono/zencomic-0.1.tar.gz