feedburner is really a free autoresponder! most people don't seem to see this, you can create news letters via blogger, sign up forms via feedburner and you create your newsletter on-line in blogger and it get delivered to subscribers - your newsletter is also a blog - in feedburner you can find out when people unsubscribe and loads of other stuff in there. you type it delivers! it still FREEEEE ya know!!!!!
See this Amp at http://bit.ly/gu7Emg