Yahoo ads seem to have something in common. The button – call to action.

Great article by Luke Wroblewski on how Yahoo’s version of a product (Maps, Local Search, Image Search, etc.) compares to Google’s:
At a high level, Yahoo! has better integrated business goals with their product designs. For example, their comparison shopping site features multiple entry points that better match consumer shopping behaviors (browse by brand, browse by [...]

Google Patents
Yahoo Patents
Microsoft Search-Related Patents