The launch was cancelled and has been postponed for several months now.
But now all the problems with the external tank have been fixed and the shuttle has been rolled out on the launch pad in preparation for the launch tonight.
The launch will be broadcast live on NASA TV and is scheduled for 22:50 CET tonight (you can see the official countdown clock at the NASA shuttle site).
As I mentioned in the previous post this is going to be the last flight of the Discovery and the third-to-last flight of the entire Shuttle program. Hopefully we can make something else just as cool as this to get more stuff into space.
Pictured: 2 million tons of awesome