To distinguish from all of the other bright green and red shiny "download me now" buttons, and minimize chance of user confusion (this thread == QED). I would suggest a button that has chirp logo on it.
Maybe folks from the community with photoshop skills can submit a few samples?
Thanks to Tom for altering the download page for more clarity. The size of the download button is pretty comical and I don't think I want it to stay
quite that big forever, but right now it seems quite apropos.