The Guild of Maintainers has started a Blender Mesh / Object Repository Program.
The repository contains meshes that are zipped up blend files that are for free use, donated by Age Creators and Modelers. No donation of a mesh is required to download. Download is unlimited. Meshes are free to be used in either your Ages or to simply mess with in Blender.
All meshes have their textures stripped from them to keep file sizes low.
If you're looking for meshes stop on by, or if you like to model and want to advertise some of your work, come on down.
If you model in 3DS Max or Maya and still want to share your work, contact Andy Legate at the GoMa and I'll show you how to export your work so that it can be imported into Blender.
Here's the link:
GoMa Mesh Repository Program