i think thats based on people who have the alexa browser dealy thingl; they base their statistics on how many visits are made to each site only from people who have the alexa thing. it really isn't all that accurrate.
BTW, I think the only reason why site's like Yahoo and MSN is popular because they're set as startpages for all the don't-know-what-a-computer-is-people but no one ever uses them. I mean, it's just crap! they don't provide any good services!
-where is the money, lebowski?!
-I think it's down there somewhere (toilet), let me have another look.