At work, we recently launched Campaign Tracker, a browsable database of campaign events planned by the 2008 U.S. presidential candidates. This is the latest section of The Presidential Field, washingtonpost.com's guide to the '08 presidential elections.
The site's goals are to compile as much information about candidates' travel as possible and to make it easy to browse all of that information in a variety of ways. Our staff has done a great job compiling all of this.
The list of candidates gives you an overview of recent and upcoming campaign events. Each candidate gets his or her own page (e.g., Mike Huckabee). In addition, each candidate gets a page for each state he or she has visited -- e.g., Mike Huckabee's visits to Iowa, or the full list of states Barack Obama has visited.
You can browse by date on a color-coded calendar, and, of course, each day has its own permalink (e.g., April 13, 2007). Each state gets its own page, too, so you can keep an eye on past and future candidate visits to Illinois, for example.
We've got RSS feeds for every candidate and every state, too. Full information is here.
The site is fully Django powered.