After all the various discussion of whether Apple would or would not allow it: it’s there. Craig Smith has a free-download version of Frotz available, which comes preloaded with a bunch of games (9:05, An Act of Murder, All Roads, Anchorhead, Balances, Being Andrew Plotkin, Bronze, A Change in the Weather, Child’s Play, Christminster, Curses!, Dreamhold, For a Change, Heroes, Jigsaw, Lost Pig, The Meteor, the Stone, and A Long Glass of Sherbet, The Act of Misdirection, Photopia, Slouching Towards Bedlam, Spider and Web, Varicella, Vespers, The Weapon, and Zork (MIT version)).
It also has a button that taps straight into IFDB, and downloading a new game adds it and its cover art to your game collection.
Plays a little slowly with Bronze, but faster than the reports I’ve heard of the game on other PDAs (and Bronze does whacking lots of pathfinding all the time). Older I6 games are faster.
IF cover art looks really nice on the iPhone screen, too.
Emily Short's Interactive Storytelling 