San Diego chapter of the MCA-I. The monthly meetings of the local MCA-i chapter are a great place to meet professionals in the film and video business. The MCA-I is also a great resource to find qualified professionals who can get the job done.
http://www.sdmca-i.org/
San Diego Film Commission is staffed by wonderfully friendly people who work really hard to make your shooting experience all it can be. There are no permit fees for shooting in San Diego and the Commission has set up a great hotel discount program. If you're shooting in Baja a call to the Film Commission will smooth the way on both sides of the border.
http://www.sdfilm.com/index.php
San Diego Filmmakers: A local group for independent filmmakers. Meetings are held on the second Tuesday evening every month and are attended by 80 to over 100 people on a regular basis.
http://www.sdfilmmakers.org/
San Diego Screenwriters Association. This is our local screenwriters group that conducts seminars and workshops to improve the skills of writers at all levels. The monthly meetings are free.
http://www.sdsaonline.com/Home_Page.html