PCU New Hampshire (SSN 778) will officially put on the "USS" tag with her commissioning Saturday at Portsmouth Naval Shipyard. Some logistics information is here for those planning to attend; for those who can't make it, you'll be able to view a simulcast here starting at 1000 EDT tomorrow (opens your media player).
As with all ceremonies of this nature, the crew has to practice. Here's a photo of the "manning the rails" walk-through:
Other photos of the lead-up to the ceremony can be found here, here, here, here, here, here, here, and here.
Update 0900 26 October: The New London Day has a report on the commissioning that includes a photo gallery and a discussion of Virginia-class submarine construction timelines. They mention that this is the first year since 1996 that two SSNs were commissioned in the same year. [As you remember, USS North Carolina (SSN 777) was commissioned in May.]
Update 1332 28 October: Here's the Navy website report on the commissioning, with its own photo gallery and a link to a short video report on the commissioning ceremony.