The space shuttle Atlantis blasts off before sunset on a much delayed mission to continue construction of the International Space Station. Liftoff occurred on time at 7:38 p.m. EST. This clip starts at T-31 seconds and runs through booster separation.
Source: NASA TV (3 min 44 sec MPEG-4 (H.264) file)
Download this clip to your hardrive.
(Windows users right-click this link. Mac users control-click this link)