I thought: what if we could add extra images for each model uploaded to 3D Warehouse, like on TurboSquid or other on-line libraries? Currently the only image is generated from SKP model. Some more images could show details of a model without need to enter 3D view (which often renders too long to wait), a rendered scene, raw wireframe or texture maps. Possibilities are endless.
Another nice feature (this one was already posted somewhere, I think), would be ability to follow a user or collection, so we would get notified via e-mail or SketchUp account about new models added to followed collection or by followed user.
Downloading entire collections would be cool too!