Weird Visual Artifacts in Leopard?

I have gotten some strange visual artifacts, since upgrading to leopard. The first 2 times I saw it they were in my iChat window, so I thought they were a problem with iChat, but I just got one in the middle of my desktop. I have attached a screen shot. Since I was able to capture it, I assume it is not my video card. Is anyone else having this problem, or is it just me?

EDIT: I just Googled, and it seems some people are having problems with their X1900, but they look different then mine. I have an X1600