The APS maintains a website with tips, tricks, and plans for outreach activities.
Need seed funding for an outreach program? Look for grants from the APS (and its New York State section) and Society of Physics Students (SPS).
Physics Central is a great place to read about physics in the news, learn about experiments and demonstrations, and connect students and the public to physicists.
The American Association of Physics Teachers has resources on their website.
A guide to physics on the web can be found on the Physics Website.
The Institute of Physics has a resource page on their website.
The FYFD (fluid dynamics group) can be found here.
The Physics Instructional Resources Association website is very useful.
The Quarked!TM Adventures in the Subatomic Universe site also has some useful information.