That Old Power Law Magic

Just wanted to pick out one detail of the news that Google is buying Aardvark:

86.7% of Aardvark users had been asked by Aardvark to answer a question, of whom 70% actually looked at the question and 38% could answer.  50% of all members had answered a question (including 75% of all users who had ever actually interacted with the site), though 20% of users accounted for 85% of answers.

You power users are your user base.  Treat them well.