The ThinkPad Tablet 2 is a great tablet running Windows 8. It rivals the ipad in size and weight yet brings full Windows 8, including inking with the optional pen.
The video below shows a walk around the hardware that makes up the Tablet 2 and demonstrates using the pen. The demonstration shows inking in Windows Journal, OneNote, and Microsoft Word, along with using the pen in place of a mouse on the desktop.
The Surface Pro from Microsoft is now available for purchase and comes with a pen. Inking should work the same on Microsoft's tablet as it does on the ThinkPad Tablet 2.