Chess software that shows current score When playing computer chess software I find myself wondering "who's winning right now according to the computer?". For example: I make a bad move but I don't realize it yet - but the computer looking 5 moves ahead immediately realizes that I've made a terrible mistake.

The computer AI must have this information internally (it's own evaluation of the current board position).  Is there an example of a computer chess game that shows this (ideally for iPhone so I can teach myself while on the train)?
Disclaimer: I wrote SmallFish.

I would recommend SmallFish on iOS. It's free, and it has the most powerful engine on iOS. It has very advanced analysis feature, look at the screenshot