Please consider patronizing one of the latest Open Design projects, Dark Roads and Golden Hells:
http://www.koboldquarterly.com/k/front-page9819.php
I actually found out about this from from the front page's twitter feed and decided I really wanted more planar stuff in print.
This should be a great experience and ultimately a great product!
Maybe I can persuade you.... since my secret Primer identity is actually Dan Voyce.
I got started as a freelancer because of Planewalker.com and the adventure I wrote here ('Desire and the Dead'), so I'm keen to pay you all back with the best homage and extrapolation of classic planar material that I can. All help greatfully appreciated!
As a side point, i've been reminiscing about my previous Planescape experiences over on the Kobold Quarterly site. One of the next two blog entries I write (not sure which one quite yet) is definitely going to plug all you lovely Planewalker people!
http://www.koboldquarterly.com/k/front-page9890.php