Still, apart from its front-runner status, Google is also remarkable for its pace of innovation and for how broadly it seems to interpret its mission to "organize the world's information and make it universally accessible and useful."

The company's current lineup of offerings includes: software for searching personal computer files; an e-mail service; maps; satellite images; instant messaging; blogging tools; a service for posting and sharing digital photos; and specialized searches for news, video, shopping and local information. Google's most controversial venture, Google Print, is a project to copy and catalog millions of books; it faces lawsuits by some publishers and authors who say it violates copyright law.

Google, which tends to keep its plans secret, certainly has the wealth to fund ambitious ventures. Its revenues are growing by nearly 100 percent a year, and its profits are rising even faster. Its executives speak of the company's outlook only in broad strokes, but they suggest all but unlimited horizons. "We believe that search networks as industries remain in their nascent stages of growth with great forward potential," Eric Schmidt, Google's chief executive, told analysts last month.

Among the many projects being developed and debated inside Google is a real estate service, according to a person who has attended meetings on the proposal. The concept, the person said, would be to improve the capabilities of its satellite imaging, maps and local search and combine them with property listings.

The service, this person said, could make house hunting far more efficient, requiring potential buyers to visit fewer real estate agents and houses. If successful, it would be another magnet for the text ads that appear next to search results, the source of most of Google's revenue.

In telecommunications, the company has made a number of moves that have grabbed the attention of industry executives. It has been buying fiber-optic cable capacity in the United States and has invested in a company delivering high-speed Internet access over power lines. And it is participating in an experiment to provide free wireless Internet access in San Francisco.

That has led to speculation that the company wants to build a national free GoogleNet, paid for mostly by advertising. And Google executives seem to delight in dropping tantalizing, if vague, hints. "We focus on access to the information as much as the search itself because you need both," Mr. Schmidt said in an analysts' conference call last month.