We recently launched our automatic RSS-to-email tool, and bloggers are really eating this up. Some of them are asking for the ability to include multiple RSS feeds into one campaign. Okay, we’re working on that. In the meantime, you can mash up your multiple RSS feeds into one master feed (and then do all kinds of insane things to it) by using Yahoo Pipes (http://pipes.yahoo.com/).
Below is a quick video on how to use Yahoo Pipes to create a master feed, then feed it to MailChimp for email delivery.