Welcome seb07!
The beauty of SBI! is that you really can use the brainstorming tool for any site. There's no way for them to restrict you from doing that. I use it all the time for my non SBI sites.
There are tons of tools out there like SBI! that have the built in SEO submissions, rankings. I'm not saying those aren't good and you can't build a successful site with them but with SBI! you also get a ton of other tools as well. SpamChecker, Blog, Value Exchange (helps find link partners), Form Build It!, autoresponders, Sitemap submitter, and I could go on for days. So it's really a comprehensive suite of tools that quite frankly no other product has.
I'm moving this thread to the SBI! forum, by the way.