Multiple personalities in one brain
Similar to the way I can opt to turn on and off different calendars, it would be great to turn on and off and view multiple brains at once. Turn off "business" brain and those thoughts aren't visible. Or different passwords for different merged brains, so different users have different access to thoughts and notes.

-
James commented
Great idea. I would like to see being able to have multiple users viewing the same brain but having only certain levels of access to certain parts of that brain.
-
Karl Hebenstreit commented
[10 of 10] My understanding of this idea would be similar to have a ".brain tag" where a thought could be assigned to one or more .brain files. Being able to filter so that you could be viewing one ".brain" at a time would go a long way toward being able to have a single .brain file, but be able to share portions of a .brain.
-
Karl Hebenstreit commented
This has been my nemesis since I started using the PersonalBrain (1998/1999). I've been making some progress in this area recently by using tags. I've been organizing my tags through a 'taxonomy'. I'm using GTD, and have .inbox, .actions, .processing , the context-sensitive @home, @work,... and & for communities of practice. As I'm getting closer, I'm working on a "Curing Digital Schizophrenia" presentation which I'll be sharing on webbrain