I am working on a content publishing app for email in the ESP space called Sendicate http://sendicate.net. If you have ever battled with the ubiquitous Mailchimp/Constant Contact/etc etc then you definitely understand the pain. I have just started taking closed-beta sign ups and am aiming to get the first test customers on the app next week.

For those interested in a little more details I have started blogging about some of the ideas and concepts behind Sendicate at my blog at http://www.chadyj.com