RepRapDiscount Smart Controller XXL
Smart Controller XXL
Based on bkubicek idea, we realized this smart controller.
There is a normal size display version available here: 
This Smart Controller XXL contains a SD-Card reader, an rotary encoder and a *very large* 20 Character x 4 Line LCD display. You can easy connect it to your Ramps board using the "smart adapter" included.
After connecting this panel to your Ramps you don't need your pc any more, the Smart Controller supplies power for your SD card. Further more all actions like calibration, axes movements can be done by just using the rotary encoder on the Smart Controller. Print your 3D designs without PC, just with a g-code design stored on the SD card.
This version is 100% compatible to the normal size Smart Controller. Have a look here for more details: 
Pictures of a Smart Controller XXL made by RepRapDiscount.com
Open Source Files
You can find the open source files here: http://forum.reprapdiscount.com/forums/oss/
Where to get it?
If you don't have the mood to build it yourself you can just buy direct from our ReprapDiscount Online Shop
All parts are licensed under Attribution - ShareAlike.