The Brainstorm is easier to understand as an extension of Talk. Anybody can start or contribute to a discussion in Talk, but if a feature request or a proposal for improvement gets special interest then it is better to move it to Brainstorm for better processing and influence to those able to implement such proposals.
Therefore the URL should be talk.maemo.org/brainstorm.
And therefore talk.maemo.org should have a forum called Brainstorm (between General and Community?) where all the discussion threads from Brainstorm ideas would be placed. This forum should be moderated in a way that all threads created should correspond to a Brainstorm idea.
talk.maemo.org is a very popular destination. The threads in the Brainstorm forum would be seen by many users that would swim up th the Brainstorm pages of topics they are interested about. There they could leave their votes for posterity. This Brainstorm forum would probably become an important if not the main gateway for people landing in the Brainstorm.
Note that this forum would also be a de facto solution for Watching brainstorm since talk.maemo.org is well equipped with per-forum feeds, email notifications and so on.
This solution assumes that Single Sign-On is implemented across maemo.org (it's coming).