More online sites available with more material choices
Shapeways' site looks nice indeed, but the idea of online ordering is not new :
Materialise was already on the online market since 1997 has with their service called
OnSite, they have a big range of materials from which you can choose.
Shapeways offers a library of models, where OnSite expects you to have a model.
The site is a bit outdated and only supports Internet Explorer but works perfectly : a plugin installs so that you don't have to upload your model to see a price.