Andrew just bought a MacBook Pro for his wife and she can't use web pages that have flash embedded in them out of the box. It didn't work on Chrome or Safari, but it did work on Firefox.
Leo says that MacBooks don't come with Flash installed. So all he needs to do is download and install the stand alone Flash installer from Adobe. He should close the browsers before he installs it. It's odd it didn't work on Chrome, though, because Chrome comes with Flash built-in.