AOK

The STS-121 mission appears to be achieving its objectives so far, including docking with the International Space Station (ISS), validating the intactness of the Shuttle's thermal shielding, and yesterday's EVA (Extra-Vehicular Activity - the formal name for a space walk) which repaired some critical ISS hardware and tested the sturdiness of a boom that could allow the crew to do repairs on the bottom side of the Orbiter, a capability that is crucial for NASA potentially giving a go-ahead for a final Hubble servicing mission.

Check out the Space.com STS-121 mission page for links to mission reports as the flight progresses.