I found this fun site http://alchemytoday.com/obamataxcut, which calculates how much you will be taxed under the Obama and McCain plans. I get a ~$980 tax cut under Obama. McCain would tax me ~$900 more than Obama.
Here is a graphical representation of McCain and Obama tax plans. It's from the Washington Post, who I am a little annoyed with at the moment, but it seems to follow the taxpolicy.org calculations