If you practice SCRUM at your workplace you should be familiar with planning poker - where the team sit down and try and come up with estimates for a user story showing numbered cards usually using the fibonacci sequence.
Seeing as 90% of the team have iPhones why not try and get rid of the boring cards and replace them with an iPhone app - Agile Poker. It does the job. Pick numbers easily, bright colours so they stand out and there's a few customisation options. Plus, you can look on Twitter or Facebook and pretend you're picking your estimates.
Screenshots and a demo follow!
