if you have any questions and or comments about Ac3D just ask or send me a PM.
I noticed a question if some of the work your doing will have problems with 6.0. Most of the changes are the way things are handled, GUI changes, and a few little things under the surface.
6.0 is easier (for me ) to work with so you guys that use it should get a kick out of it.
Note: I hope most of you are using Dennis's plugins for your work. His Knife tool works wonders and He has a program that takes images and turns them into maps for AC3D. Might want to check it out. You can find most of Dennis's stuff at the Ac3D website.
(if your wondering, I'm on the Ac3D alpha test team so that is how i know about 6.0)