Added bonus (from the Terms of Service):
Google claims no ownership or
control over any Content submitted, posted or displayed by you on or
through the 3D Warehouse. You or a third party licensor, as
appropriate, retain all patent, trademark and copyright to any Content
you submit, post or display on or through the 3D Warehouse and you are
responsible for protecting those rights, as appropriate. By submitting,
posting or displaying Content through the 3D Warehouse, you grant
Google and its end users a worldwide, royalty-free, non-exclusive,
perpetual license to exercise the rights in the Content, as stated
- to reproduce the Content;
- to create and reproduce derivative works of the Content;
- to display publicly and distribute copies of the Content;
- to display publicly and distribute copies of derivative works of the content.
for the avoidance of doubt, Google reserves, and you grant Google, the
right to syndicate Content submitted, posted or displayed by you on or
through the 3D Warehouse and use that Content in connection with any of
the services offered by Google. Notwithstanding the above, end users
may not aggregate the Content obtained from the 3D Warehouse for
redistribution, and may not use or distribute Content obtained from the
3D Warehouse in a mapping or geographic application or service without
Google’s prior authorization.
I'm no lawyer, but that sounds a lot like you can use the models for your own purposes with no copyright infringements or lawsuits.