Loren forgot to include the references with his post.  Here they are. :)

1.      Penny D et al.  Improved analyses of human mtDNA sequences
support a recent African origin for Homo sapiens. Mol Biol Evol
1995;12:863-82.
2.      Hedges B et al.  Human origins and analysis of mitochondrial DNA
sequences. Science 1992;255:737-39.
3.      Hammer MF.  A recent common ancestry for human Y chromosomes.
Nature 1995;378:376-78.
4.      Krings M et al.  Neandertal DNA sequences and the origin of
modern humans. Cell 1997;90:19-30.