If you're looking for a small, rugged tablet PC running Windows 7, the Motion Computing CL900 may be the device that will meet your needs. You can start placing your orders for this tablet from a number of different resellers (I would personally recommend Allegiance Technology).
The CL900 is one of the more expensive slate tablet PCs, but it's also one of the few that is built as a rugged device. I had a chance to test one when I was at HIMSS earlier this year and I was thoroughly impressed by the build quality and the overall design of the device. Prices start at $899 and go up to $1,349.99 for this little tablet computer.