Exporting rigged and animated models from Blender to Papervision3D is now possible thanks to an update of Cast3D, a 3D animation framework library for Adobe Flash in ActionScript3. (Check out this example).
From the Rustpunk blog:
Blender users finally have a way of bringing animated models into PV3D thanks to the newest revision of Cast3D which now also features a dae2X3c converter (see previous post if you're not familiar with cast3d). Dmitri Sviridov has been hard at work on fixing bugs and ironing out the kinks in both the blender collada exporter and the cast3d library.
Check out the Rustpunk blog for more useful information on PV3D.