Dave made a VESA mount laptop stand for his Lenovo X61 tablet laptop. He writes:

I run Ubuntu Linux on it but this Instructable is probably Windows compatible. I bought a VESA mount arm from Ergotron. I wanted to be able to reposition my laptop for better ergonomics but I wanted to be able to still use it as a tablet (possibly while standing). There are several VESA mount options for laptops, but none seemed to suit my needs. I decided to build this out of Plexiglas and several screws with nuts and washers.

Make a VESA mount tablet PC stand – Link.