University of Wisconsin
The Why Files: Cosmic Consummation
After a dramatic introduction to the "Love affair," between Earth and Theia, this site gives support to the claim that the moon was created by a collision between these two planets. Also contains a brief bibliography.
Other
Scientists Say Star Collision Caused Dinosaur Extinction
"Israeli scientists have a new theory on why the dinosaurs became extinct: cosmic radiation that bombarded the Earth following the collision of two neutron stars." This article discusses the details of the theory.