Both Booster Recovery Vessels, the Liberty Star and the Freedom Star, were just heard on 9132 kHz USB in radio checks with the Booster Recovery Director at Cape Canaveral.
Various listeners in the eastern US have also heard comm on 10780 kHz USB from Cape Radio. The 9132 shore side is a remote transmitter at "Andrews."
Astronauts are currently entering the vehicle.
Weather is now 90% go.
The launch is being blogged here.