I spotted a funny but yet basic SEO concept in a Google Webmaster Help thread.
One webmaster asked, and I quote:
It true that Get sitelinks from Google is directly related to traffic of alexa.com
The first flag that this is a poor question is that I had to edit several typos in the question itself.
The second flag is that a Googler comes in and gives a straight forward answer, as opposed to tip-toeing around the response.
JohnMu from Google clearly said, no! He said:
Just to be very clear: Alexa's metrics do not play a role in whether or not Sitelinks are shown for a site for a specific query.
There you have it - a clear, very clear, response from Google on Alexa's role at Google, or lack there of.
Forum discussion at Google Webmaster Help.

Comments:
William Vicary
08/06/2010 12:26 pm
I can sleep better at night now I know this :D If only they were half as direct in answering other questions!
Ka Damar
08/06/2010 11:33 pm
google pagerank alexa rank is always the opposite, if a good alexa rank alexa rank is a little, on the contrary, a good google pagerank is a value much
No Name
08/07/2010 07:16 pm
very good answer! alexa's cocnept is very confusing sometimes.
Greg Swan
08/07/2010 10:34 pm
Nothing better than a direct answer from Google. Thanks!