The purpose of this site is to serve as a feature request board for Blender, the free and open source 3D modeling and animation suite.
The idea is that people post their feature proposals for Blender here on this site. Other members of the site review those proposals. Submissions appear on the main page and are subject to be voted upon by the membership. That's the basics of it. It works like this:
Proposals can either be voted up or they can be voted down. Developers can visit the site looking for ideas on what to work on... or they can pitch their own ideas and see if Blender users think those ideas are useful or helpful.
With any luck, some of these ideas will get migrated to be an official design task on the Blender developers' issue tracker.