Despite the ongoing drama between Microsoft and Yahoo during the month of April, the number of people visiting Google hit the 141 million mark. This put it ahead of Yahoo for the first time ever as the most-visited Web site in the United States.Yahoo wasn't too far behind, though. In fact, it fell short of Google by just 400,000 visits, with 140.6 million. That's a pretty small percentage, but it's enough to put Google on top. Microsoft ranked third, with 121.2 million visitors for the month. Rounding out the top 10 are: AOL, FOX Interactive Media (aka, MySpace), eBay, Wikipedia, Amazon, Ask.com, and Time Warner. Other notable companies in the top 25: No. 11, Apple; No. 14, Facebook; No. 20, Craigslist; and No. 24, Verizon Communications.

ComScore's executive VP said in a prepared statement, "April was a very active month. Google took the top property position, thanks to continued search growth and rapid growth at YouTube." Other areas that people used Google for included its career resources. No word on what sort of contribution Apps or Docs or Gmail makes to Google's rankings. Given the wide variety of content available from both Yahoo and Microsoft, I also would like to know what percentage of Google's total hits come from YouTube.

The top three players remain unchanged, however, and Google's besting of Yahoo certainly hasn't dampened Microsoft's interest in Yahoo. Just this morning, it offered up a new solution to tie the two companies together.

How these metrics will change if Microsoft and Yahoo band together is hard to say. Certainly, with the amount of overlap in services, it won't be as simple as adding Microsoft and Yahoo's site visits together. But I would expect the number to vastly surpass Google's current 141 million PV mark. How Google (or anyone) would combat a combined MicroHoo is going to take some serious work.