AirPrint on Windows with iOS 5.x.x
Follow first 4 step: http://jaxov.com/2010/11/how-to-enable-airprint-service-on-windows/
Then: http://jailbreakqa.com/questions/75138/airprint-for-windows-not-working-for-ios5-devices?page=1#79096
Optional: http://www.michaelontech.com/2009/10/hide-user-account-in-windows-7.html (Because you have to enable Guest Account)
Enjoy!