I agree group projects bite, but I figure my goal is simply to come out with a good project and an A, and if I have to do most of it, so be it. I don't mind carrying others along if my goal is met.
I've found that no one wants to be in charge, and they are happy to have one person (moi) come forward and say look, here's how we could divide the project up, you do this, you do that, etc. Usually one of us is a powerpoint whiz, someone else is good at editing, someone might be good at finding internet images to use.
There's no way around it, someone will always carry 80% of it themself. Usually it's the someone who wants a good grade the most!