If you aren't on Spaceflightnow.com right now, I suggest you get there soonest. Their Mission Status Center has the latest news on the final Space Shuttle launch, which as of this writing is targeted for 11:26 a.m. EDT on Friday, July 8, 2011. (That should be today, if this posts as scheduled.) If you have the right software, the Mission Status Center will include an audio/video feed. I usually leave that on mute until the end of the hold.