The Huffington Post's new "Fundrace 2008" feature allows you to see who the big donors are in the 2008 presidential race campaigns, with a Google maps mash-up that lets you search by region, donor name, party affiliation and donation amount. It's a light-hearted but also serious look at who the big donors are (it mostly tracks donations over $200) and, in some cases, you can see who's playing "both sides". They also track donations from employees at specific companies. For example, Microsoft and Google employees have primarily given to Democrats by over 2:1 ratios.
A great example of using technology to bring greater transparency to the democratic process.