I doubt it will make much of a dent. Google right now has like 80% of the market share for search. Yahoo has like 15% and MSN has less than 5%.

Even my friends who work at Yahoo prefer to use Google.

I have a friend who works at the hotmail division at Microsoft and he prefers to use Gmail. "It just works better" he says.

Even if Micro-Yahoo could get it together and get out a significant upgrade to their product now - Google has been warned of their teaming and will undoubtably have something readyto counter.