The Russian Progress M-10M resupply spacecraft completed its docking with the ISS at 7:28 AM Phoenix time (1428 GMT).
Endeavour is scheduled for launch at 12:47 PM Phoenix time (1947 UTC). You can watch the launch live at NASA TV.
Notice: at 1610 UTC, the launch of Endeavour was scrubbed due to a failed heater in the APU (Auxiliary Power Unit) of the Shuttle. It looks like there are multiple failures on APU1. The Load Control Assembly appears to be the problem, although a short is possible.
Launch would be no earlier than Monday, and likely Wednesday.
Additional discussion of the APU problem can be found at NASASpaceFlight.