Just a quick acknowledgement of the latest (and excellent) discussion of potential printing from the iPhone. Kara Soos over at the Databazaar.com blog has pulled together the historical setting (yes, thanks for the link Kara!), along with a discussion with two iPhone applications developers, Josh Keay and Canis Lupus. In "Will iPhone Printing Become a Reality?", find a great summary around current thought and analysis. The key questions explored include "why/how does a user want to print from an iPhone?" and "what's the likelihood they'll soon be able to do it?".
Highly recommended reading!