[a2tech]

If you like SES you should check out Email Octopus. It hooks up to SES and gives you a nice GUI for putting the messages together. We moved a good sized client over to them and their marketing people wanted a GUI and it filled the niche nicely.

[zachlatta]

We used to use Email Octopus and switched to Sendy. We like Sendy's interface a lot more.

[arbuge]

There are many such interfaces - including free options like phplist...