SEATTLE — Brian Dorsey set out on a mission this month: develop and launch an Internet service in less than six hours.

The 33-year-old Seattle software developer wasn't looking to set a Guinness World Record. He just wanted to explore whether something worthwhile could be built on the Web in a short period of time.

Dorsey, who enlisted the help of about a dozen acquaintances from entrepreneurial groups in town, nearly made his target. About seven hours after the group gathered in the living room of his home on the morning of Oct. 6, Tagmindr —an online bookmark reminder service — was born.

Call it a startup on speed.

Dorsey's project, part of an effort by a group of entrepreneurs and developers known as Seattle Saturday House, might be an extreme case. But it speaks to a larger trend. The cost and time it takes to build new Internet applications is shrinking rapidly, changing the dynamics of the technology industry that for years has been plagued by slow development times and countless hours of product testing.

These projects take an entirely different approach from the software and Internet firms of the late 1990s. The new ethos among entrepreneurs: Throw something out there quickly and see whether it sticks.

Getting an Internet service off the ground has never been so easy, with open-source software and low-cost Web site hosting available at the click of a mouse. Advice, support and, in some cases, development talent can be easily obtained through blogs or online groups. New online platforms, such as Facebook and MySpace, provide fertile ground where entrepreneurs can immediately test the value of their services.

Of course, turning these Web applications into meaningful businesses is an entirely different matter. It's unclear whether any of them will make money. But this new breed of entrepreneurs is quickly trying to create features that enhance online photo, music or storage services.

It didn't take much to get Tagmindr up and running, just an initial idea, a domain name and a few smart people. All told, about $30 was invested in the project, including the snacks that Dorsey bought to fuel developers during the coding marathon.

In creating an online application in an afternoon, Dorsey said, he simply wanted to get more practice in product development and programming.

"It was kind of the idea of fail early and fail often," said Dorsey, who was astonished that 12 people devoted a Saturday to his project. "Ironically, I think the Tagmindr one was amazingly successful."

And Tagmindr isn't the only quick-start startup to launch in recent weeks.

Mark Maunder recently created Feedjit.com, an online application that allows bloggers to track the geographical location of users, in less than half a day.

Powered by one "finely ground" cup of coffee, the Seattle developer worked from 4 p.m. to 2:30 a.m., noting in a blog post that it took him 10½ hours from the "first time my hand touched the keyboard until I fixed the last bug."

After spending three months creating LineBuzz and eight months on GeoJoey, Maunder said he just wanted to have some fun with Feedjit. So he set a 12-hour time limit on the project.

"You can get obsessed with picking just the right colors or layouts. I didn't worry about that," Maunder said. "I said, 'This is just going to be functional,' and I got it out the door."

That's also what has driven Ben Curtis, a freelance software developer who spent part of his time this year on an online job-applicant tracking service called Catch the Best. He sank about 125 hours and less than $5,000 into the project, setting a launch deadline for the end of September.

"I am a developer, so, by nature, I want to add the gold-plated features and continue and continue and continue," he said. A deadline "pushes you to get something done and get some feedback on it."

Both Curtis and Maunder worked alone, a strategy that some believe is the best approach for these quick efforts.

"I think the bigger the team gets, the more challenging it is to execute quickly," said Maunder.

Dorsey agreed that a larger team could derail a project, saying Tagmindr probably could have been created by one very focused person in six hours. Multiple contributors also open up potential problems in terms of ownership of the idea.

"Being a developer, that was the thing I had thought the least about up front. And, in that respect, I have already learned a lot from this project," Dorsey said, adding that Tagmindr's code was released with a liberal open-source license.

That wasn't a problem for Maunder, who is now trying to keep up with demand.

More than 5,000 bloggers in over 100 countries have adopted the Feedjit service. Feedjit also is attracting more than 11,500 page views a day.

"It is a weird thing, because the faster I execute and the faster I get it to market, the more successful it seems to be," he said.

Now, Maunder is tinkering with ideas of how to build a business model around Feedjit. He wants to expand the concept to provide more real-time statistical information to bloggers.

"I didn't set out with the idea that it is going to be a long-term thing," he said. "It was just a one- or two-day experiment, but it gained a heck of a lot of traction, and it has gone viral."

In its second month, Maunder already is dealing with the "geometric" growth of the service. He built the site using all open-source technologies, from the programming language to the Web server to the database engine.

"You don't need to raise

$1 million so that you can buy Oracle or buy a license for three Windows Web servers," Maunder said. "The only thing you pay for now is for your hardware and your bandwidth."

He estimates that it took $690 to build Feedjit, including $10 for the domain name.

And what was the big lesson that Maunder learned during his 10½-hour development push?

"Get your product, your idea, your service to market as quickly as possible and get feedback from customers," he said. "If you work in a vacuum for six months or a year without getting that feedback, you tend to forget about the customer."

Curtis, who sold an online conference application last year for a slight profit, added that he's learned the importance of developing products that matter to people.

"The big trick is not to build something," he said, "but to build something that people will actually pay you for."