I'm too lazy to copy it over to a different forum right now and converting the synthax, but some time ago, I wrote two articles on giantitp.com, both of which are mostly Planescape-ish in style, so I thought I could actually post them here as well.
More Planetouched races:
[http://www.giantitp.com/forums/showthread.php?t=109785
and
Findelwald Tungsten's Diseases of the Planes
http://www.giantitp.com/forums/showthread.php?t=129929