u3d became a popular format for 3D graphics and with Adobe Acrobat/Reader 7.07 embracing it
(sorry, everybody but MacOS/Windows users seem to be left on cold now) it seems to be great
for electronic publishing (look at first few links from http://www.microtype.com/homenewupdated.html)

Unfortunately so far only CAD and Framemaker seem to have u3d export.

My suggestion: provide u3d export for Maple 3D graphics