An excerpt from what is, at this moment, the most popular wsj.com article in Asia
Can you print from an iPad? Apple didn't build in a printing function, so you can't just tap a menu button to print an email, photo or Web page. But a few third-party apps allow printing of some items from an iPad to a networked printer. One is Print Online. It costs $5 and I tested it successfully. But these apps are complicated and limited workarounds—inadequate substitutes for built-in printing.