Thanks for making the time to write the suggestion. An online library of 3D models has been on the TODO list for some time and your mentioning it will make it move upwards. Still, I am afraid it will not be available in the upcoming version, but there will be more example 3d models shipped with that version.
Online library of 3d models is a bit more complicated than an icon library. Problems like thumbnail generation, data extraction (for example if a 3d model has any parameters) or relative location of textures must be solved to make its use an enjoyable experience. The upcoming version will address some of these problems and prepare the necessary environment for a true online 3d model library in the future. The target is to be able to comfortably search and open a 3d model located on a server from within the application and also update it if you have the access rights.
But this is probably not what you asked for. A simpler version of the 3d library, where people would be able to download individual 3d models using a web browser will be available by the end of 2008.