Developer If you want to write plug-ins for Rhino WIP, this is your category.
Mesh WIP Discuss all things related to Mesh development here.
Rendering WIP The place to discuss all rendering related issues.
Sub-D Everything related to a new subdivision surface object in Rhino.
PaperCuts This is the place to discuss "Paper Cuts", those Rhino issues that are <strong>painful but not life threatening</strong>.