NASA has a few new images online, showing some significant foam shedding from the ET during yesterday's launch.

The larger loss, and the one shown on a stillframe from the ET Cam feed, is a piece of the PAL ramp (the foam fillet along the cable tray at the forward end of the LH2 tank). Two other comparatively small foam loss areas are visible by the port (left) bipod fitting -- and yes, that is the same area from which the foam that doomed Columbia originated (and which was subsequently redesigned).

The blackening at the aft end of the ET is due to radiant heating from the engine plume, and does not appear unusual.

UPDATE: This problem appears to have caused enough concern at NASA that the fleet has been grounded again until it can be resolved.