Just got my update notification. I'm on my second attempt after I got the download bar (gray) without any progress. I took out the battery and trying again. Bought my phone 1st week it came out, my # is from CA, but I live in HI.
That's something I wouldn't even consider doing, pulling the battery while the rom is being written to. Corrupting the brains is called 'bricking' and it pretty much takes a trip back to Motorola to fix it. So far it seems like Motorola did good, there's no stories of "It Killed My Droid" floating around but I wouldn't tempt fate.
I have done battery pulls on my Droid (usually because the GPS went stupid, last time it had me near Australia instead of Phoenix) but I always do the button power down first, long press on the top button and select the off menu item for a graceful exit.