PBH-10 is delayed:

The launch has been postponed. It appears that the best weather for launching is 0000-0300 UTC, 4 May 2009, though this may change with relatively short notice based on ground wind conditions at the launch site and the position of the jetstream relative to the launch area. To clarify: we do anticipate the best time to launch is 0000-0300 UTC; however, the exact launch day may move to the right or left from 4 May 2009.

As always, the latest updates are available via PBH3 Twitter account