The DC PHP Conference has announced their Call for Papers for this year's conference (being held June 1st and 2nd):
In its fourth year, the DC PHP Conference will bring together PHP practitioners, business managers, and government officials from around the world for two days of exceptional presentations and outstanding networking events. The DC PHP Conference returns to George Washington University, Washington, DC, June 1 & 2, 2009, and promises to be the biggest DC PHP Conference yet!
The Call for Papers will close April 1st, so be sure to get your submission in quickly! They give a list of some of the "areas of interest" you might look into when proposing the talk including best practices, the "art of PHP", PHP in the Enterprise and general Open Source topics.
You can submit your idea here.