[HOT TIP] HOW TO PROTECT KEYWORDS FROM COMPETITORS BY BLOCKING ALEXA BOT FROM YOUR WEBSITE
Now, while this is pretty desirable when you are grabbing the keywords, someone doing the same with you would definitely be harmful.
So, you just need to add the following information in the robots.txt file of your site/blog.
User-agent: ia_archiver Disallow: /
Alexa - Information for Webmasters
Hope this would help a few new Warriors.
Samir