Most bloggers focus on their RSS subscribers, but I often remind people that around half of my subscribers subscribe via email using Feedburners email subscription feature.

While this free service is brilliant, it does have a couple of issues you need to be aware of.

First while your overall count is added to when people sign up, unlike if you were using a competing email service like aweber, your count can vary or be lower than you would think, even when people do not unsubscribe. This is because after signing up the new user has to click a confirmation link and they have to continue to receive emails.