BlenderNation collects the best free Blender 3D model downloads from all across the Blender community. Check this section if you're looking for an asset for your next 3D project. If you would like to suggest a model for this section, you can submit it here.
Links: Downloads, Textures, HDRI images, Materials, Models & More
Blender Suco published a HUGE list of interesting resources for Blender users.