This is so beyond just a website that its cool. mGive is a very cool serivce that allows non-profits and charities to receive donations via contributors mobile devices. And this is mostly an SMS-based service. From their website:

mGive allows your organization to raise money through text message donations. Supporters of your cause send a text message to your keyword & short code and their $5 or $10 donation is applied to their cell phone bill. Once you create a campaign, you can drive awareness via print, radio, television, online and social network adverts.

mGive provides a campaign-specific keyword, a shared shortcode (for use across several mobile carriers), online reporting and marketing tools, widgets for many blogs and social networks, a volunteer management tool, SMS scheduler, and donor collection reports.

The serivce is limited to US mobile carriers at this time (seems as if carrier billing is enabled). But for the most part can allow many organizations to get started with mobile giving pretty quickly. Check out the mGive website, Facebook, or Twitter for more information.