PCalc - a great iPhone utility belt

I've long been a user of PCalc on the Macintosh. I love it's feature set and most of all the elegance of its implementation. James Thomson, its author, has shown great commitment to his products and so I was very interested when I heard a iPhone implementation was available.

PCalc for the iPhone exceeded my expectations and has earned a place on my iPhone's home page. I'll first cite one of the coolest innovations and that is James' undo implementation. To undo an entry you simply swipe your finger right-to-left across the display area. To redo simply reverse the motion. Multiple levels of undo are of course available. Very natural and efficient since no screen space is needed for buttons or menus. Another innovation is the use of the shake "operation" on the iPhone. Simply shake the phone twice to clear and three times to do a clear all.

Some of the other features that set it apart from Apple's version, and the iPhone app crowd in general, are its support for RPN, operations in a whole range of bases, a simulated tape so you can see the history and result of interim results, and finally a very convenient and comprehensive set of unit conversions as well as constants. 

Highly recommended! Check it out here or look it up in the Apple App Store.