A great suggestion from Jon Ericson is to have Weekly Topic Challenges, these would involve 4 steps:
Step 1: Ask for topic ideas.
Select underrepresented topics, or topics we feel need a boost.
Step 2: Post a challenge.
The challenge would then be posted in meta at a 'usual' time of the week, possibly at the start. Give a full week for the challenge to play through.
Step 3: Profit!!!! Tally the results.
Step 4: Repeat until no more topics are left
What do people think of this idea? Do we want this?
If so, what topics could we choose? (1 per week), what dy of the week should we start it? (We'd have to use UTC time, bearing in mind where people are).