This will only be of interest to Curio users.
I'm stoked. I just discovered I can grab the icon from the Curio project titlebar and drag it into TheBrain which then creates virtual folders for Curio's folder structure (for that project). This means my searches in TheBrain include idea space names. The TheBrain search doesn't show you the found idea space name, but it does include a link to the Curio project(s) that match the search. For instance, searching for "sharpening" in TheBrain included the following results:
Clicking the links takes me to the appropriate Curio project. If necessary, I just perform the search again in Curio which is able to include all the text from various idea spaces within the found project. Too cool!
Edit: I should have mentioned at first that it is important to have your TB preferences set to link, rather than move files. I also have my prefs set to create virtual folders.