For the last two days it's looked like Bing started powering Yahoo Search, and, what-do-you-know. We were right.

Officially announced yesterday.

(Link is to a good article about the change and what it means, on Search Engine Watch.)

"MicroHoo" = Microsoft + Yahoo, and yes it is a bit derogatory. The combined market share is now somewhere around 25% of all U.S. search, compared to pushing 70% for Google. Will this change make them a viable challenger? No.

But one big change will be not having to run Bing and Yahoo click ad campaigns separately (starting probably in about a month). Possibly, it will drive Ask and the other miscellaneous search engines even further down into the weeds.