GraphPad (2D drawing app for the iPad)

[tfdesign]

This one looks quite good!

[flash=425,344:152i4nrq]http://www.youtube.com/v/x1t2Vw2cs80?s=1&hl=en_GB&fs=1&&[/flash:152i4nrq]

@unknownuser said:

Graph Pad Sketcher is a touch based engineering drawing application that allows users to quickly create accurate, to scale drawings on the iPad. Sketch a design and GraphPad will automatically straighten lines and add a discrete set of points to work with. Add arcs, circles and dimensions and then scale your drawing to reflect the actual dimensions for your design. Finish off your design with comments and arrows, then email it to other members of your team. Specifically designed for contractors working on-site who need to relay design information back to clients and colleagues.

(itunes.apple.com)