This is exactly the kind of app I was hoping to see in the new App Store. Its useful, attractive, and the price is right. For 99 cents I didnt think twice, and its no wonder you see it near the top of the most popular paid apps. I like the design of it as well. It looks good, and doesnt make frivolous use of the new Cocoa Touch widgets (like that spinning dial -- the star wipe of iPhone UI -- that everyone loves to use, no matter how inappropriate). The programmable shortcuts are nice.
My one request is that Id like the swap button to swap not only the units, but the values, as I sometimes do a chain of conversions and would like to carry the results forward.
Oh, and by the way, the "key click" feature supposedly introduced in the latest update does not work for me (I hear nothing). Doesnt really matter, just thought Id mention it.
Great little app!