While I've argued that a combined Microsoft & Yahoo won't have much impact in search, there's no denying that it will create a daunting content/pageview property. Data on both follows.
First, here is the current search market breakdown. As you can see, a combined Yahoo/Microsoft is still less than half the size of Google.
More interesting, however, is the list of Microsoft/Yahoo properties, including category ranking and share. The combined companies would lead in a host of categories, from email (there's gotta be something wrong with the following share data), to finance, to sports, to movies, with only maps as the Google holdout.
