The Extension Warehouse is the online repository of Extensions for SketchUp. You can visit it at http://extensions.sketchup.com/ . You might post in here if:
You are having problems using the Extension Warehouse.
You have questions about how the Extension Warehouse works.
You wish to share something in the Extension Warehouse or test that it is working for you.
You have a feature you’d like to see in the Extension Warehouse.
You’re having a technical problem with some aspect of the Extension Warehouse.