The seven astronauts of STS-119 are strapping into the Orbiter for tonight's launch. NASA reports:

Astronauts Board Discovery

Image: Discovery's crew member wave to well-wishers as they make their way to the Astrovan which will take them to Launch Pad 39A. Photo credit: NASA TV
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Launch Day Highlights

Image: The STS-119 crew members wave to the crowd before climbing into NASA's Astrovan. Photo credit: NASA TV
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All times listed in EDT
2:30 p.m.	Live launch coverage begins on NASA TV and Launch Blog
3:48 p.m.	Countdown resumes at T-3 hours
3:53 p.m.	Discovery astronauts depart crew quarters for Launch Pad 39-A
4:23 p.m.	Discovery astronauts arrive at the launch pad and begin to board Discovery
5:38 p.m.	Discovery's hatch is closed and latched for launch
6:28 p.m.	Countdown enters a 10-minute planned hold at the T-20 minute mark
6:38 p.m.	Countdown resumes at the T-20 minute mark
6:49 p.m.	Countdown enters a 45-minute planned hold at the T-9 minute mark, during which the Mission Management Team, and Launch Control team will conduct polls to give a final "go" decision for launch
7:34:44 p.m.	Countdown resumes at the T-9 minute mark
7:38:44 p.m.	Auxiliary Power Units start at the T-5 minute mark
7:43:44 p.m.	Discovery launches on the STS-119 mission
7:52:07 p.m.	Main Engine Cut Off (MECO)

Live webcast from KSC. Preflight pics are up at the JSC Gallery and Orlando Sentinel. More preflight pics and video at KSC. Discussion here. Check the links at right for play-by-play and NASA TV.