I use the "beta" stuff in myYahoo quite a bit and I like it. It provides search suggestions as you start typing (I've come to rely on them--instead of finishing what I was going to type, if Yahoo recognizes it in a slightly different phrasing I go with it), map links, etc.

I use it as my start page with rss feeds, etc., so it's kind of my default.

I still have to go to Google for some things, though, when Yahoo can't find it.