How about an update?

The app hasnt been updated since iOS 3 - 3 years ago. Unfortunately this is all too common.

How about an update to support the following:

Multi-tasking

Retina graphics (app icon, unit icons and button/UI graphics)

Taller screen of iPhone 5.

Those are all the super-easy updates. If you want to be adventuresome, provide a unit editor to let customers add their own custom unit so that we can put an end to all the whining that the app is missing this and that esoteric unit.

Pixaholic about Convert ~ the unit calculator, v1.0.1