Ok, I heard about the Flat Eart Society in class today and decided to google it and came across this site. I think one thing that proove's your theory wrong is a lunar Eclipse. Yes, I read the FAQ, and found this:
Q: "What about Lunar Eclipses and Moon Phases?"
A: An invisible celestial body, known as the Shadow Object, passes between the sun and moon during a Lunar Eclipse. This projects a shadow upon the moon.
Now come on. A invisible object that casts a shadow? Last time I checked, invisible objects dont cast shadows. Are you guys just coming up with this as you go along? Something smells fishy to me, and the Earth clearly casts a shadow on the moon, and If you will notice, this shadow is round. And here is proof:

Ok, so you may think that someone clearly faked this photo, to try to trick us all. Well, the good thing about it is that you can see these Lunar Eclipses for yourself. The next one is July 7, 2009.
Thoughts?