According to the NY Times:
HP "has quietly introduced a free service designed to make it possible to print documents on any printer almost anywhere in the world. Cloudprint, which was developed over a period of several months by a small group of H.P. Labs researchers, makes it possible to share, store and print documents using a mobile phone."
PCWorld says that it will redefine mobile printing.
I'm thinking I can now print boarding passes for SWAir at the hotel :) Plus, I have been squawking about network printing for your clients for a while. If you have a store, why wouldn't you let your clients print to your network printer? Then they have to come pick it up - that's foot traffic.