Ah, new-age meets old-school!
It’s Rogue for the iPhone/iPod Touch.
Free from Gandreas Software, this iteration of the father of dungeon crawling is advertised as being faithful to the original. This version is controlled via touch using a ‘Commands’ menu for actions such as opening doors and climbing stairs, although these actions also have a gesture-based ‘hotkey’ for those of us just barely patient enough to play a traditional roguelike.
Playable in both the original ASCII as well as a nice tileset.