If you can't bear to abandon your iPod or cell phone even though you're going to a formal event, you can wear the Koyono BlackCoat-T, and keep all your gadgets close without looking like an uncivilized lout.
There are four compartments in the hidden pouch, all with easy access from the zippered front. The thin cotton fabric makes the BlackCoatT comfortable under a suit jacket.
To the rest of the world your shirt will just look like this:

The shirts were included in the gift baskets for the 2004 MTV Movie Awards presenters. You know, because Lindsay Lohan needs more free things.
The introductory price for the BlackCoatT is $15 and is available from Koyono.