What's the best way to break up with a clingy girlfriend?

I’ve been dating my current girlfriend for about two months now and she is unbelieveably clingy. She always has to know where I am, whom I’m with, and what I’m doing. It’s just non stop phone calls and it’s driving me nuts. Furthermore, she gets pissed off when I hang out with my friends that are girls, even if I’m in a group. Basically, she’s a whole lot of crazy.

So what I want to know is what is the best way to dump her? I’d like to do it in person, but the question is how do I do it?