If you have tried the Feedback Form, you have seen how a form can be built. That form can then be tied to an autorespond email if you like.
There may be instances where you don't need any information beyond an email address from your customer. You may also want to be able to send out a series of emails to that customer. In that case, can you use a BayJen Web Autoresponder page such as this one.
To demonstrate, enter your email below and we will send out emails with links to 3 of Brad Callen's e-books. You will get one email right now and then one more next week, and the last email the week after that.
Right now
Brad's first 10 lessons in one easy to read e-book
Next week
Adsense Arbitrage - A Keyword Elite Case Study
Two weeks from now
Welcome to ‘The Player’s Guide to AdWords Domination’