Peter Corbett of iStrategyLabs is helping the Greater DC Cares with a way to get help and support from the tech community. Please take a look at the wiki Peter has setup: http://istrategylabs.com/islwiki that has information about projects that can help non-profits.
I was browsing through the wiki and the projects in the Web Design Category are very interesting . They appear simple and could be completed pretty soon. Along with a feeling of having done something I am sure the DC tech/blogger community will definitely pitch in to promote the people or organizations who help in this effort. I know Peter Corbett definitely will and he has a lot of ideas :)
http://istrategylabs.com/islwiki/index.php?title=Web_Design/Dev .Greater DC Cares serves as the hub of the non-profit community in DC - they provide service to all the smaller non-profs (shelters, soup kitchens, etc.)