FactCheck.org, from the Annenberg Public Policy Center of the University of Pennsylvania, monitors news releases, debates, web sites, speeches, etc. for the accuracy of what political candidates are saying. A mobile version of their service has just been released.
PolitiFact, a joint project of the St. Petersburg Times and Congressional Quarterly, analyzes the candidates’ speeches, TV ads and interviews and determines whether the claims are accurate.
Source: Annenberg Public Policy Center, the St. Petersburg Times, and CQ