Ergonotics has Convex Stylish Converter (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for FREE for a limited time.

Convex is so smart, it understands you! Just type any conversion and get the result immediately for over 950 units for 20 categories.

Convex is the first converter that gets you by letting you type conversion naturally, in you own words. This makes Convex the fastest converter there is!

You know what you want to convert, just type it! Convex’s natural processing engine does the work for you. You’re 5ft 10? Just type that (don’t even mention the inches), Convex will figure it out and will even offer a smart default conversion to metric.