"Autodesk will soon introduce a free mobile version of the software that will run on the iPad, iPhone and iPod Touch. That version has more limited capabilities, Mr. Hanspal said. But with it, an engineer, for example, could bring drawings to a job site on an iPad, rather than on a big roll of paper, and make annotations on them."
But that's more than made up for in the added usefulness.
For reference, i have a far harder time reading an HTC Incredible in the sun.