Being able to build WYSWIG messages then broadcast them to the group of people that used the "Opt-In" link on your site to receive your newsletter. A back-end database like with shopping cart creator with an email "Opt-out" so people can get off the list if they want. You could stay in touch with your customers and send newsletters with weekly or monthly specials and links to those items. points of interest, whats new?, employee of the month... That would be killer.
I'll buy it!
![:P](/images/bbcode_emoticons/tongue.png)