It may be awhile before you can take an actual trip to space, but now you can take a virtual one anytime you like. The International Space Station is now streaming 24/7/365 on its UStream channel.
According to io9 the feed is not quite 24/7 because it can only be active when the station is in contact with the Earth. The screen will turn blue during "loss of signal" periods. Other than that though, you will be able to see internal shots of the crew, external shots of the Earth from HD cameras mounted on the ISS, see a sunrise or sunset every 45 minutes and listen to conversations between astronauts and mission control.
Live streaming video by Ustream
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