The Web 2.0-social networking phenomenon's seemingly irresistible force field has ensnared yet another niche: travel.

Dopplr, a hosted service, allows users to track the travel schedule and whereabouts of themselves and their friends through a visual interface reminiscent of Facebook, rather than traditional means such as e-mail.

Although the application is still in private-beta phase, its backers have wasted no time in courting workers in large enterprises -- those with the most intense travel schedules. While for most users, Dopplr is invite-only -- a buzz-building gimmick harkening back to the early days of Gmail -- the company more recently created the Dopplr 100. Employees from the 100 companies on the list can sign up for the service. Among the 100 are Sun, Microsoft and IBM.

Other startups, such as Tripit, are also trying to marry social networking and travel itineraries. Tripit takes user-submitted information such as airline and hotel confirmation e-mails and uses the data within to generate a tailored itinerary, replete with maps, local weather info and the like. It also allows users to create lists of friends.

But Dopplr may stand out in terms of early buzz -- the company claims nearly 100,000 users -- and for quickly orienting itself around business users.

Dopplr's chief operating officer, Taneli Tikka, said the company's enterprise ambitions arose from research into their existing user profiles. "We analyzed the user base and found that clearly there were industries ... that were using it more than others," he said.

James Governor, an analyst in the U.K. with Redmonk, is a vocal cheerleader for Dopplr. (Governor also shares an office with Dopplr founder Matt Biddulph, but says their business relationship ends there.) Governor recently issued a challenge to software companies listed on the Dopplr 100 through his blog, urging employees to sign up.

He says Dopplr ultimately provides "manufactured serendipity," for social and business-related scenarios.

For example, if you had to travel to a distant city on business, you might well spend the night in your hotel room alone. But Dopplr could alert you to the presence of a friend or colleague who by happenstance is also in town, Governor said.

Governor also notes the enduring presence of Web 2.0 conferences, despite the ever-growing richness of the communication-centric technologies that give rise to such events. "Increasingly we work and meet in online interactions. .... That's not to say it's not rich, but it's no substitution for face-to-face contact."

The IDG News Service is a Network World affiliate.