There's no question as to the tremendous portability of the MODBOOK, but sooner or later you're going to need to mount that bad boy onto something so you won't get a nasty neck kink. (Looking down directly at the tablet while you draw will do this)
Axiotron is coming out with an attachment that will enable the Modbook to hook into all VESA type mounts. My source at Axiotron indicated that they are fast-tracking this attachment to be available by March 2008. But in the meantime, this nifty, multi-adjusting laptop mount from ERGOTRON might suffice. The LX Desk Mount looks well made and sturdy and allows for freedom of movement while the Modbook sits on a secure cradle.
I think i'm going to order the LX and try it out. I'll let you know how it works with the Modbook.
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Another, more cost-efficient solution could be another product from Matias called the iRizer which is basically just a laptop stand that can be adusted to a total of 4 positions. It's most upright tilt is at 50 degrees which may or may not be enough for general viewing since this product is meant to be used for a laptop with a screen. (where you can adjust the screen further)
This is definitely one of those accessories that you would really have to demo to see if it'll work out.
ERGOTRON and MATIAS links are available on the sidebar.