Here are a few iOS apps I have on my iPhone. I'm not sure they are going to replace the sticky notes and a whiteboard.
Clock Pro - it has a multi-city world clock for visualizing timezone differences. Great for those dis-located teams.
Agilely Timer - a clock timer for scrum meetings and round table discussions.
User Stories - a backlog management tool for user stories with estimates & priority.
Game Storming - a set of exercises (game if you wish) that create synergy in groups and discover knowledge.
Scrum Cards - estimation cards and cheat sheets for process.
LeanKit - a Kanban tool, integrates with the web tool LeanKit Kanban.
Whiteboard Capture Pro - whiteboard photo capture post processing.
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Microsoft's Photosynth - a spherical panorama capture tool which integrates with photosynth.net site.
There are many other tools on the App Store, which ones have you found useful? Please comment and let me know.