I just wrote a paper for my biology class about the genetics of race. Some of the things that I found out were so cool, and it made me look at race at a different angle. Basically, race doesn't exist. Skin color does not classify a person in a racial group, becuase if we do DNA samples of people with a specific type of skin color, we could find that a white person is more closely related genetically to a black person than to another white person, and vice versa. You guys should read the article, it's so cool, and while you're at the site, click around...it has some really cool articles abotu other stuff as well.
http://www.sciam.com/
the article is called "Does race exist?" and it's about a third of the way down on the page on the left.