The article Ray mentioned re. the Out of Africa theory and the multiregionalism theory can be found at:
http://www.magazine-rack.com/
Click on the science/technology magazines and then click on Scientific American. The article is listed in the table of contents. This is a nifty website.
One question re. the multiregional theory and interbreeding between early humans and Neanderthals, if early Europeans did interbreed with Neanderthals, why doesn't it show up in our DNA?
Kath