Tangant
Has a collection of themes for use in a PostNuke System along with some block modules [Open Source, GPL].
http://www.tangant.com

Rose and Curt
Good to the Last Drop
http://www.curttimmerman.net/pn/

Athena Microsystem Solutions LLC
Hall-effect current sensing modules, SIMMStick modules and Wireless modules.
http://www.athenamicrosystems.com

Digi-Block, LLC
The path to number sense begins with a little green block! Come See the Math!
http://www.digi-block.com/

Omni Block
Insulated concrete block, technical and installation guides, gallery and distributors list.
http://www.omniblock.com

Blockalert
A window into spam activity based on IP block hierarchy.
http://www.blockalert.com/

Defco
Manufacturers of the Blockmaker mobile block-making machine. Includes cost comparison with standard block construction and adobe building codes.
http://www.defcoinc.com/

Ivory Tower
St. Ego’s Ivory Tower is discovered by explorers, by those searching for something they do not yet understand. What are you searching for? Reality, being subjective, is escapable. The Ivory Tower exists as a sanctuary to help those who are lost find their way home. Whatever your reality, Ivory Tower will help you escape it, if only for a while...
http://www.ivory-tower.net/

DAISy
CD, DVD and SACD applications by DAISy, using Philips audio and video technology : CD, SACD, DVD video, DVD audio can be supplied to audio and video manufacturers with full technical support
http://www.daisy-laser.com/

PostNuke Modules CVS
The world's largest development and download repository of Open Source code and applications
http://sourceforge.net/projects/pn-modules