Time is getting close for the next NASA space shuttle launch with a launch window opening July 1. You can get complete details including the official media press kit for the STS-121 mission on the NASA STS-121 webpage.
And you can get the best frequency list on the planet for monitoring NASA and Shuttle comms from the Monitoring Times Reference Library. If you need up-to-date shuttle frequency information look no further than the critically acclaimed Monitoring NASA Communications webpage.