Alan Keyes has filed a lawsuit. Philip Berg's Writ of Certiorari, filed in the U.S. Supreme Court is awaiting a response from Obama and the DNC, which is due by Dec. 1. If you can't read the entire thing, at least read Berg's Writ through the Table of Contents.
Aside from the specific questions about Obama's citizenship, there are the larger questions: Who insures that candidates are eligible to run for president? Who has the right to challenge their qualifications and where? How much does our constitution matter?
HT: Die Schreiben von Schreiber