Right now Brainstorm is a lot like playing darts. You throw some ideas up and hope some stick. Most don't. Most get lost in the shuffle. Others may get a few comments, but where does it go from there?
Brainstorm deserves to be more than a glorified suggestion box. There's definitely an audience. There's definitely interest. So where can we take that? Where does that audience want to go?
I feel Brainstorm should incorporate some of the collaborative, non-judgemental and creative-inducing aspects of a whiteboard, a wiki, or a 'traditional' face to face brainstorming session. Tags, clouds, themes, and even prototyping (in some manner) may all have a place. Maybe we need to brainstorm on this :-)