Wow, there are some "Categories" now within "Talk" - very helpful. Better still, there's an "Interest Check" category. I hope Massdrop adds a "Sort By" dropdown (like there is inside each Talk) so all Talks in a Category can be shown in a certain order: date initially posted, or last date commented on, etc.
I hope they are still in the process of categorizing all the Talks, since some Talks don't have a Category yet:
UPDATE: Just figured out I can pick my Talk's category by editing the post.