GLAST will be launched May 16, 2008. The LAT and GBM instruments have been integrated onto the spacecraft and the entire observatory is about to undergo thermal-vac testing at the Naval Research Laboratory (NRL).
For more details, see the homepages of the LAT, the GBM, the ACD, and the spacecraft.
The deadline for the first GI Program proposal cycle was on September 7, 2007. See the proposals page for more details.