Simonyi, 60, along with an American and a Russian astronaut, was launched aboard a Russian Soyuz rocket at 11:49 GMT from the Baikonur cosmodrome on the Kazakh steppe, in what could be the last space tourist trip for some time.

"I feel great and I am looking at the Earth," he told mission control in Russian after lift-off, as his wife, Swedish millionaire's daughter Lisa Persdotter, tearfully joined the cheers on the ground.

Simonyi, one of the brains behind Bill Gates' Microsoft, paid 35 million dollars (28 million euros) for the voyage, despite no longer being counted a billionaire in a ranking by the US magazine Forbes.

He previously travelled to the space station in April 2007, becoming one of a select group of wealthy civilians, most of them from the United States, to have pioneered space tourism.

The launch comes as Moscow is doubling the number of manned space launches to meet the needs of the expanding space station, with a second launch due in May.

The head of Russian space agency Rosksomos, Anatoly Perminov, said that for a period it could be the last time a space tourist would be taken on board due to increased demand on the programme, but had high praise for Russian-US space cooperation.

Thursday's launch went smoothly and the flare from the spacecraft's rockets could be seen gradually disappearing into the sky before it reached low-Earth orbit a few minutes after lift-off.

The professional spacemen on the flight are Russian Gennady Padalka, who is to become the space station's commander, and American Michael Barratt, who takes over as flight engineer.

Perminov hailed what he described as a new era in US-Russian space cooperation, echoing the upbeat tone of the countries' leaders following the inauguration of President Barack Obama.

He confirmed that Russia plans to double the number of manned launches to the space station this year to four to support an expansion of the station's science programme.

"Almost as soon as the Cold War finished it was decided by our countries' political leaderships to carry out great projects together. Now a new era is starting in our cooperation.

"In space cooperation between our countries there will be even more great projects, maybe future flights to asteroids, to other planets, to Mars.

"Everything is possible. It all depends on the political will of our countries' leaderships," said Perminov.

He noted that two new space laboratories are to begin work at the space station, which orbits at about 350 kilometres (220 miles) above the Earth.

One is Japan's Kibo module, planned for astronomical experiments, and the other is the European Space Agency's Columbus module.

Russia is due to become the main provider of human flights to the space station in the next few years as the United States plans to take its space shuttles out of service and is still working on a replacement.

In Thursday's launch, the Soyuz rocket hurtled into space at speeds of around 13,400 miles per hour, or 22,000 kilometres per hour, subjecting its passengers to huge gravitational forces.

Simonyi is to spend 10 days aboard the station before returning to Earth with two current crew members, while Barratt and Padalka are to remain for six months.

It takes two days on the journey to the space station due to the need for efficient use of fuel.

The launch pad used on Thursday was the same used in the first ever human space flight, that of Soviet cosmonaut Yury Gagarin in 1961.

Space Adventures, the American company that arranged Simonyi's flight, said it was planning with Russian authorities to carry out the first space launch exclusively for paying tourists in 2011.

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Baikonur, Kazakhstan (AFP) March 24, 2009
US software pioneer Charles Simonyi should on Thursday become the first person in history to travel into space twice as a tourist, in trips costing a total of 60 million dollars.