Only request is that the annotations can be viewed while going through the moves on a board.

I use the ChessDB app on the iphone which does the job. The annotations come up after each move in like a pop up text message type of thing. You can easily upload files onto it to be viewed via itunes

There are two free apps that also works, chess viewer and CBase chess.  Some pgn files don't work in CBase chess so Chess viewer is probably better,  but the annotations comes in a separate screen.