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DoSomething.org, and online network for helping kids get projects started for social change by providing resources and funding, has created a couple of widget options for web promotion of these projects. There's a "Volunteer Now" widget, which lets site visitors enter their zip codes and find projects in their area.
The other widget is "What's Your Something" which helps site visitors find widgets based on interest. It may be equally effective to have a third widget (or a single widget) with both functions included, offering two ways in which to help match site visitors with projects. Wikimedia, Scrapblog and DonorsChoose have all announced their initiatives for raising awareness and gaining donations for various funds as well.