Oh gosh, evolution is my favorite topic ever.
biggrin (I am not joking)
I haven't read the entire thread, but did you guys know that there is some evidence that the lineage of chimpanzees/bonobos and humans could have separated via a chromosome mutation?? I would link something explaining it, but I think that would be above the general genetic technical knowledge around here. It's really interesting because a chromosome change like that would probably have been extremely sudden - that is, the offspring who inherited the mutation would immediately be unable to reproduce with the rest, as far as what I know about this.
http://www.5min.com/Video/How-Chimp-Chromosome-13-Proves-Evolution-11049 - Video about it, although it's less scientific and more political/religious than I'd like to see.
Also, other cool things:
http://www.cnn.com/2009/TECH/science/05/19/human.ancestor/index.html - An article about a fossil presumed to be the ancestor of apes/monkeys/lemurs, humans included of course.