I just had a baby boy on May 21st, 2009. Way back when (at least it feels that way) when I had my second ultrasound, the ultrasound technician told us that we were expecting a little boy (which is what we had been hoping for!). I asked her how she could tell and she said that with a little girl, they look for a hamburger shape in the genital area, and with little boys, they look for a tiny 'turtle'. Sure enough, he had a little turtle shape, and sure enough, several months later, I gave birth to a beautiful baby boy. Here's a link to the ultrasound pic, if you'd like to look at it so you have a better idea of what I'm talking about. Hope this helps!
http://viewmorepics.myspace.com/index.cfm?fuseaction=viewImage&friendID=38835720&albumID=2165555&imageID=51152902