50 People 1 Question
This idea is inspired by this wonderful video Fifty people, one question. Actually, I've seen many bloggers do something similar on Twitter of course, the creator of that video really took it further. Still, you can always do something similar. Shoot an email to 25 (or whatever number) of people, ask them just one thought provoking question and post their answers.
Twists you can use:
Ask your Twitter friends
Ask people influential in your niche – this takes a bit more preparation but could be a nice traffic magnet.
Ask those who've come out on top of trying situations against all odds
Ask the kids
Ask the seniors