God has a plan for each one of us, but we have free will.

[originalpckelly]

Anyone want to take a shot at explaining that one?

Aren't those two things mutually exclusive?

If you have free will, that means you can choose your destiny, as the choices you make before arriving at your destiny are your own.
If God has a plan for you, that means he has selected your destiny, and at decision points in your life your choices have been constrained in such a way as to give the result God chose.

You might be able to get away with saying that it's a little bit of both, that God has selected your ultimate destiny, but he allows you to choose the path to it.

The problem with that is that you still don't have free will, because God would have to bend your will to cause you to end up at the destiny he has chosen for you.