I discovered this not long ago. Here it is:

Put down in Google for ALL questions search:

site:answers.yahoo.com "keyword"

You can Combine keywords (my favourite)

site:answers.yahoo.com "keyword"+"keyword"+"keyword"
EX: site:answers.yahoo.com "where to buy"+"cheap" returns 27 questions asked in the past hour when i wrote this!

If you want only open questions put this:

site:answers.yahoo.com "keyword" -top answer -best answer

If you want it down by specific time you can tell google to show recent or 24 hours or week.

I was amazed to find out that a highly competitive niche was getting 1000 questions a day! WOW. Can you imagine that???

Enjoy!