If you are tentatively planning to attend one of the final shuttle launches, the uncertainty on launch dates just got a bit more certain; plus — an added benefit — we won't see the end of the shuttle program until 2011.
NASA announced new target dates for the final two (and maybe three) shuttle missions. STS-133 is now aiming for November 1, 2010 at approximately 4:33 p.m. EDT for the final flight of shuttle Discovery, and for STS-134, February 26, 2011 at around 4:19 p.m. EST for shuttle Endeavour's last launch. The potential bonus mission STS-135, would launch sometime in August 2011, if approved by Congress and NASA. The latest word on that was that NASA officials hope the decision would be made sometime this month.
http://www.universetoday.com/2010/07/01/new-dates-for-final-shuttle-launches/