I recently participated in the Canon DSLR Speed Challenge #72- "Building the Picture" <-- click to see and I thought of maybe doing something similar for macro photography. The rules would probably be very similar only restricting the photos to macro photography. The winner of the macro challenge of the week would pick the new macro challenge topic for the next week and pick the best photo that matched the topic of the week.
Would you macro photographers be interested?
If yes then please vote 
Yes - Great idea!
