I know you are looking for a packaged solution but I will add this one to the list in case the others do not work for you.
http://www.connectone.com/products.asp?did=73&pid=98
It pretty much has the ability to do anything web wise. Send/receive email, send to FTP, on-board web site, serially controlled, etc...

Here is a test thingy I have running part of the time.
http://mackrackit.com/mac/ichip/ichip.html