Ask HN: Multi-touch CAD Controller (New Menu designs for the iPad) - Feedback?
blog.maideinc.com
blog.maideinc.com
Otherwise, I like it :) you don't even need full multitouch device for that kind of stuff sometimes. I had loads of fun with touch screens you can buy from ebay for ~15£ for a 7" transparent one. Just plug in via usb and treat it as another pointer device.