That's cool and was very much needed. Good thing they decided to go with Ruby, which makes it possible to run cheaply on Heroku.
For those looking for an even more simple solution to this problem (with less features, of course), buy a domain name, host an HTML page on Amazon S3 and use the Mailchimp form.
@uniclaude: the HTML page on S3/CloudFront and MailChimp direction is built into my project called Gulp AWS Splash, which is another LaunchRock open source alternative at https://github.com/niftylettuce/gulp-aws-splash. I did a similar Show HN not long ago for this.
Adding in Heroku 1-Click Deploy and purify-css today!
For those looking for an even more simple solution to this problem (with less features, of course), buy a domain name, host an HTML page on Amazon S3 and use the Mailchimp form.