GitHub - Lauszus/PS3-Controller-BT-Library-for-Arduino: Supports all three PS3 controllers via Bluetooth using the USB Host Shield from http://www.circuitsathome.com/ - This is the old version of the library. The newest one can be found
Hook up PS3 controller to USB Host shield « Circuits@Home
Amazon.com: ATNSINC USB Host Shield Compatible for Arduino MEGA 2560 1280 Support Google Android ADK & USB HUB Function (2PCS) : Electronics
Amazon.com: USB Host Shield Compatible for Arduino MEGA 2560 1280 Support Google Android ADK & USB HUB Function : Electronics
How to Connect a PS3 controller to an Arduino with a USB host shield and Bluetooth dongle (Part 1) - YouTube
Control an RC car with a PS3 controller, Arduino UNO, USB host shield and Bluetooth dongle (Part 2) - YouTube
Using a Keyes USB Host Shield with Arduino Uno Rev3 - Project Guidance - Arduino Forum
Arduino USB Host Shield (DEV-09947) - Next Day UK Delivery - Proto-PIC