"Master and Commander" - Russell Crowe
"Dead Calm" - Nicole Kidman (before she met that Cruise guy...)
"Waterworld" - Kevin Costner (yes, I know it was terrible, but it has great sailing footage!)
"Mutiny on the Bounty" - B&W original and remake with Mel Gibson as Capt.
Someone else already mentioned it, but "Wind" has really great footage also.
Enjoy!