Google Inc. and Yahoo! Inc. are revving up their online search engines as the once-friendly business partners shift gears and prepare for what promises to be a fierce rivalry.
Google unveiled an even more powerful version of its leading search engine with the addition of 1 billion additional pages to its Web index, increasing its breadth by about one-third. Google's engine, the most popular on the Web, now spans 4.28 billion Web pages, up from 3.3 billion pages earlier this week.
By rolling out its expanded search engine early Tuesday, Google stole some thunder from Yahoo, which announced Wednesday that it's ready to run its search engine without Google's help.
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