I’ve purchased SBM for my 3G and love everything about it—but higher resolution *would* be nice (another reason I should have waited for the 3GS, huh?).  I see that the Brushes app gets around this by recording the input data used to create the image on the iPhone, but a desktop app “replays” the input to create a much higher resolution.  There is an app for the Mac and the author of the app is working on a web utility that will do the same thing for PC users.

It would be great if Autodesk could have similar functionality.

Killer app, though guys—kudos!  As for the image create on the iPhone, SBM’s is the highest res of them all ;-)

See this link for a comparison of the apps out there for the iPhone:

http://www.solidsmack.com/autodesk-sketchbook-mobile-for-the-iphone/2009-09-17/

You can see that SBM wins for highest resolution on the phone itself; though Brushes again allows higher res by redrawing the design off the iPhone, which is an interesting move.