Today is the deadline to have all your FeedBurner accounts moved over to your Google account.
Although I've heard various opinions on whether the old Feedburner subscriptions will continue to work – with some bloggers reporting that subscriptions should work indefinitely and others already reporting glitches with the old addresses – I'd trust the Feedburner to Google FAQ which reads:
“It is our intent to keep backward compatibility with your feed address as long as this service exists.”
I updated my accounts last week and haven't yet changed all the feed addresses, but the old one's are redirecting just fine.
The real issue is in updating your accounts. According to the FAQ, if you don't update your account:
“…you will no longer be able to access your account at http://www.feedburner.com, and your feeds will either begin returning a “404 Not Found” response or a “301 Moved” response back to your source feed.”
Learn more on the Feedburner to Google FAQ
After working long and hard to get your new web site up and running, you probably have little patience left to wait months and months to start getting traffic to your site and start making sales!
I've listed 3 ways to bring traffic to your sites in this article. 
I found 265 spam comments in my blog's comment moderation queue this afternoon.
Although I never became a fan of John Reese's BlogRush widget – having placed it on my site and removed it after only 2 days – I was still sorry to hear that due to “dreadfully low” click-rates across the network, John announced on October 29th that the BlogRush site and widget would be shut down.