It's worth noting that PersonalBrain 4 also has a completely free version that never times out and is still quite powerful.

You can get it at http://www.thebrain.com/download

If you want to see what people are saying about the new release, check out the forums, which are very lively: http://forums.thebrain.com/tool/mb/thebrain

Regards,
-Harlan (from TheBrain)