After 7 years in the business I would have thought Alexa would have figured out how to improve the accuracy of their rankings systems. Below is hard cold proof that Alexa's system needs some serious fixing.
Flora2000's traffic and sales for Valentine's day were more than double in 2007 and compared to 2006. But broken Alexa 2007 shows lower traffic than 2006. Take a look and decide for yourself.
Agreed that Alexa is limited by the number of installs of it's toolbar. But shouldn't they have overcome this by making deals with other toolbars like Google, Yahoo, etc to expand their base and thus accuracy?