Here is a very intuitive 3D app that just started offering a free version through Google. Tried the demo and it is good for getting rough ideas into a model form but isn't quite up to snuff as far as accurate dimensioning and template printing.
http://sketchup.google.com/download.html For just 2D Adobe Illustrator would be plenty as it has supported DWG format for several versions, and of course support for PDF format which I belive Mark posted the new airfoil templates in. It has been used to recreate fully exploded CAD files for profiles which were then imported into FormZ for solid modeling (and I wouldn't wish that task on anyone). This package feels more intuitive than AutoCAD. It's cross platform Mac/PC and of course there is a demo you can try to see how it suits your needs. http://www.csi-concepts.com/index.htm
