Live Forms already has an autoresponder capability. Why not add the ability to set up multiple autoresponders? Certainly, the first message to go out after form submission is some sort of thank you for your request. Following that, it would be really cool to be able to easily set up subsequent emails that reinforce the sales message. Why require a separate program (like Mail Chimp)? 

Of course, I can think of a couple of "gotchas" like but that's where good programming comes into play. For example, is this someone you've already sent emails to? (avoid sending duplicate messages to the same person). 

In any case, I was talking with one of my clients today and this came up. We both thought it would be a fantastic idea for Live Forms!