I'm looking for software which allows a poser (or other 3-d model to be viewed on a single computer with full 3-d control (rotation, etc.) For example, if a widget were modeled, I would like to be able to allow someone to look at the widget on their computer, and rotate it in 3-d to see different angles, etc. If anyone has any suggestions, I'd be appreciative!

This new "Atmosphere" by Adobe sounds promising for that sort of thing. Or you could build it as a QTVR.

QTVR has a format called the QTVR object which allows you to rotate the object 360%. Most 3d programs export to this format if not you can render the object rotating 180% at different angles of height and them stich them together using QTVR authoring software either from apple or a third party. I would recomend this over ATmosphere at this time only because quicktime is available for both mac and windows while atmosphere is windows only at this time. There may be other programs but I'm unaware of them and they usaully require a veiwer to be downloaded. While many computers already have quicktime installed. For more info about QTVR go to Apple's web site.

Poser Pro Pack has veiwpoint technology export options for exactly this you just export it write a htrml page to hold it which can then be hand editied and you can even store animation information also

Thanks for the suggestions!