Try this file to fix the Market place. It will make your Droid appear to be working as 2.1.
I've noticed this everytime a new build leaks out for the Droid. My theory is that so many people are wiping their phones to install the leak that the servers get overloaded from all the download traffic. Especially with Froyo builds where the app sync is automatically initiated in the background. It always seems to get back to normal after a few days.