I've encountered a similar albiet more terrifying experience this weekend. In the process of unrooting, I 'broke' my DROID. VZW is sending me a replacement but of course I fixed it just after the thing shipped.. Now I have to deny a signature on the shipment and keep my original DROID.
Anyway.. onto our issue.
I used RSDLite to restore my DROID back to good stock health. I flashed 2.0 onto it and noticed I couldn't get the OTA updates to bring me up to 2.1.
I decided to manually update myself.
You're on 2.0 so find a 2.0.1 file. Manually update to that. Then rinse and repeat for 2.1. After that you'll be up to date.
How I did it. As other have mentioned, grab the official, untainted OS image and rename it update.zip. Place this on your SD Card.
Power down the phone and while holding 'X' press the power button. You'll see nothing but an "!" mark in a triangle. NOW, press the 'Volume Up' key and the camera button simultaneously. Use your D-Pad to select the install update.zip option. Press the gold center button to select.
That's how you install the updates up to 2.1-update1.
This is were I'm at, this is were you'd like to be.
Now as for the lack of OTA updates, I've got a few theories.
1. Google and/or Motorola and/or VZW only hold current firmware versions on their OTA Update servers. Since 2.2 is coming they may have removed anything prior to that to host the 2.2 file.
2. Since the release is coming next week, they may be preforming maintenance or have taken the server offline to prepare for next week.
What we can do.. Wait until next week. If we get the update, we get it. I don't see why we wouldn't.
If we don't, we can always snatch the official manual update when it's link is posted.