Fun with astronaut mode in Google Earth
If you feel lonely floating in space all by yourself, you can make the experience a little more interesting by also showing all known orbiting satellites and spacecraft. The network link from AGI shows in real time all 12,000+ earth-orbiting objects tracked by the United States Strategic Command.
Here are screenshots looking both towards earth (with the satellite database turned on) and away from earth at Orion's belt:
Maybe you prefer to float over another planet. Here are examples of spacewalks above the Tharsis Rise on Mars using the Modified Mars overlay and over the South Pole-Aitken basin on the Moon using this moon overlay. (Note that the Mars map shows MOLA topography; if you prefer something more photorealistic, try this one.)
According to a post on the Google Earth Blog, you can also use the astronaut overlay with the Google Earth Flight Simulator to simulate flying through the 3D world of Google Earth. Enjoy!