Printer Pro lets you wirelessly print from the iPad or iPad. It can print directly to many Wi-Fi printers or any printer attached to your Mac or PC via helper application installed on your computer. Once installed, Printer Pro appears in the "Open In..." list on your device. This lets you print documents from Mail, PDF Expert and many other applications on your iPad that supports this function.
Printer Pro also lets you print webpages from Safari. Just change 'http' to 'phttp' in the address bar and the page will be opened in Printer Pro.
You can get the free helper application for your computer here: www.readdle.com/printerpro
Readdle says it will explain why Printer Pro is going from a $6.99 app to free tomorrow at 10 AM PST.