I used to like Yahoo, until I needed some customer service from them. They were, to say the least, very unpleasant, and less then helpful. Now I keep hoping for the day they go out of business, so I can do a little happy dance.
Mind you, their product is nice, but without customer service, it really isn't worth the cost, which is nothing, which says a lot, yes it does, indeed.
I think it's pretty much all in the name... I mean the search engines are pretty much the same. I, however do use Google and never Yahoo, and I also like all of Google's extra featurers (iGoogle, Gmail, Youtube, etc.)