I updated the OmniGraffle Web Design Template.
This web design template for OmniGraffle Professional provides the basic layout for a design deliverable including the following master canvases: document title, section title, wireframe (portrait and landscape), storyboard, and blank. The wireframes were created at 950px wide with guides following the Blueprint CSS Grid system. Wireframes also have 2 small hairline marks around the 600px point to mark the approximate fold. Go grab it here.