Doug,
One that I have used in the past is Constant Contact (
http://www.constantcontact.com ). Best of all you can try them out for free, and if your list is small, it costs less when you do become a paying member. They have amazing tracking capabilities.
However, that being said. After using them, I decided, why not create one myself?
So I did. I've been working on it on and off the last couple of years, and it's about ready for launch. I'm looking for some folks to help me with the beta testing (you can use as much as you want for free, even after I go live).
One minor technical problem I'm having right now is with really big lists. I put an optin list I had on there (over 17,000 email addresses) and found I had to break it into about 3000 at a time, or the pages would time out when sending.
So for the time being (until I fix that problem), you can use it for free if your list is smaller than 3000 names. It has about 90% the functionality of Constant Contact and other services (I'll be adding more, but I wanted to get the core functionality and reporting and tracking first).
In fact, I often use the built-in WYSIWYG HTML editor to write some Web pages and HTML emails over tools like Front Page, because it doesn't add all the extra useless junk that FP and others do.
If anyone is interested, send me a PM. It's fully functional now, except for the large list issue, but I just have to make a few cosmetic changes. Minor stuff.
I'll even set it up so you take a test run and see it for yourself before you decide. Just let me know.
John