Hi there,
just noticed this thread, i know the post is a bit old, but if anyone is still interested we will release a CAD app for the iPad called 'ArchiDraw'... it is designed by myself and an Engineer, and is constructed entirely from OpenGL, which makes is very fast indeed.... We are about to enter a testing phase, and trying to integrate a couple of really cool features before that.... It will certainly import and export Autocad DXF formats, along with a few others, but DXF is the important one if your are serious about CAD...
We are very excited about it, and hope to release sometime around March.... If anyone is interested please visit our page;
orangejuicestudios.com
It would be great if you subscribe to our newsletter to keep you informed of our progress, and why not even send us an email with any questions or suggestions about what you would like it to do... When we launch we are going select 10 people at random from our list of subscribers to give a free copy of the full version, as we will restrict some exporting features from the free version....
Look forward to hearing from you on the other side!
Cheers