Tis official. Today be International Talk Like a Swashbuckler tide.
Th' photos be at th' International Talk Like A Swashbuckler Tide gallery on Flickr
Th' Howto section has basic an' advanced gentleman o' fortune lingo coverin' such terms as avast! an' arrr!

Translated:

It's official. Today is International Talk Like a Pirate day. http://www.talklikeapirate.com/
The photos are at the International Talk Like A Pirate Day gallery on Flickr http://www.flickr.com/photos/talklikeapirateday/
The Howto section has basic and advanced pirate lingo covering such terms as avast! and arrr!