The wireframe stencils are now being maintained at Konigi. Please download them there.
OG 4.x palette last modified 25 October 2007. This version of the stencil set is no longer being maintained.
This is my set of shapes for making wireframes (low-fidelity web page schematics) in OmniGraffle (Mac OS X). The image at right shows the stencil in action. It consists of a basic set of shapes including: browser chrome, title and footer block, icons, form elements, a greeked text block, text headings, some boxes, label and note blocks, navigation elements, and some icons created entirely in graffle.
Purchase OmniGraffle Pro
You can purchase Omnigraffle Professional 4.0 from Amazon. I highly recommend the Pro version over the standard -- the Pro version allows you to create documents using slide masters.