Kubotek Free CAD Tool
Interesting product that allows you to open almost any CAD file and many image formats. More information is available at the web site (below). You can open, view, print, verify entities, measure, rotate, turn layers on and off, and more. The application looks quite amazing. The Viewer that comes with NX4 may have some strong competition when this is free and can view more formats.
Here is an article from Yahoo! news talking about Kubotek Spectrum product
Kubotek Spectrum
Kubotek Spectrum is downloadable viewer software for reviewing 3D models and drawings from the latest versions of the most commonly used engineering (CAD) programs. The simple Windows interface can be easily used by manufacturing, sales, support and service departments without having to learn or install a full-featured CAD system. Kubotek Spectrum fully supports view manipulation, printing, 3D shading, measurement (distance, area and volume), and publishing HOOPS-enabled HTML files but will not overwrite the original engineering file.
