fyi, I just uploaded a new build on our Novell Forge download page, mojoportal-mssql-build-2009-10-29.zip
Both this site and demo.mojoportal.com are running this build, the only difference is that www.mojoportal.com uses MySql whereas demo.mojoportal.com uses MS SQL. I have only uploaded a build for MS SQL though.
Most of the main improvements for the newsletter have been implemented including a new Newsletter Sign Up feature that you can put on a page as I have done on our home page. It's also possible now to enable viewing of previously sent Newsletters as web pages. I have never yet sent a newsletter though I already have 426 subscribers. I plan to start using the Newsletter soon. If the user is not signed in then an email confirmation is sent and a link must be clicked to confirm the subscription. I'm sure there will be a lot of false submissions from web bots, I still need to implement a few things like an easy way to purge unverified records older than x days. The newsletter is only sent to verified addresses. There is also a nice new progress bar for showing the progress of mailing to a large list.
Its also possible to put <portal:Subscribe id="subscribe1" runat="server" /> in the layout.master file if you wanted the sign up on all pages. I will need to work on new documentation for the newsletter soon.