New Road Town Fast Ferry service between West End, Tortola and Red Hook, St Thomas:

Daily service departing West End at 06:15, 08:00, 12:15, 15:30
Clears C&I at Cruz Bay, St John before continuing to Red Hook

Daily service departing Red Hook at 07:15, 11:15, 14:30, 17:45
Travels direct to West End
17:45 ferry continues to Road Town

Round Trip: $50/adult, $40/senior, $30/child (2-11), $10/child under 2
One way: $30/adult, $25/senior, $20/child (2-11), $5/child under 2

I've added the schedules to the website:
http://www.bestofbvi.com/info/info_bviferry.htm