Teacher space instead of a teacher desk...interesting idea to ponder about. I could probably make this happen if I got an additional shelving or storage unit of some sort for my teaching guides, materials, etc.
wal-mart cheapie shelves taken apart - line up underneath bulletin board wall and front of the room for classroom library and use school bookshelves for teacher desk materials. no teacher desk - take 2!:
Use colored dots to make groups easy. Put a different colored dot on each desk in a group. When you need to have a student from each table do something, you can simply ask for all the green dots to bring you the papers from their group.