Sometime during every design review it is necessary to send a CAD file to someone who may not be an everyday CAD user. When this happens it is important to have an easy way to view a file without having to buy multiple seats of an expensive software. Solidworks has their eDrawings viewer, reviewed previously, that works very well. Siemens Solid Edge also has an iPad app for viewing native files. Recently, after reviewing Solid Edge ST 5 extensively, I downloaded the viewer to see how it stacks up.
Getting files onto the viewer can be done through emails or web accessible shared drives, like drop box. The viewer works well for simple things. Rotating and zooming are straight forward and you can even hide individual parts within an assembly, but beyond the basics the viewer leaves much to be desired.
For more information on Solid Edge check out the rest of the 3D Engr reviews.