I guess Feedburner, the email subscription is now gone or soon will be. I'll be using FollowIt for now, so I guess we'll see how it works. They are trying to get things set in place shortly.
Once installed if you have already subscribed to my blog via Feed Burner, you should not have to re subscribe. They are trying to add your subscriptions to the FollowIt so you should continue to get email updates as you did before.
If you are new my blog, just add your email to the FollowIt widget and submit.