External GPU: Retina MacBook Pro with Windows 7 (BIOS) and NVIDIA GTX 760 using PE4L with Sonnet adapter.
Getting en external eGPU working with OS X 10.9 using the PE4L with Sonnet adapter.
Running a Google AdWords campaign to increase your Dropbox space - for free!
My adventures in cryptocurrency mining - and yes, you can make a small profit!
External graphics card connected via Thunderbolt using the PE4L-EC060 ExpressCard adapter and Sonnet Echo Express Thunderbolt Adapter Pro.