Just set up feedblitz with my streaming music site, (check it out in the right column). In about 5 minutes, you can turn your blog's RSS feed into an email alert.
I was mostly impressed with how many options I had. I had complete control over design, subscribers, subscribe messages, delivery schedule, and best of all it was all free. Sure, they're going to put a few ads in there, but I think my readers will be able to avoid the ads. For the most part, they don't interfere with the content.
This should be another way to get regular users on my blog.