busy building phpancake which is an open source version of stackoverflow, written with ZF and Mootools.
http://phpancake.sourceforge.net
http://moowmd.awardspace.info is the Mootools version of WMD I use.

If you think you can make the most complicated CSS+JS+xhtml combinations, and make them work on IE7 and IE8 (PHP knowledge or other server side tech is a plus)
And wish to work in the DC area,
feel free to send me a resume to itay.moav@email.sitel.org