This is a TouchOSC layout I developed for my iPad to use while in London. I couldn't bring my regular gear because of weight restrictions, so I whipped up this bad boy:
I wrote an article for DJTechTools about this mapping, and the software I used to create it. It has a tutorial and downloadable files to follow along with. I also put up the final iPad mapping on my DJTT Maps page (right now it has about 1300 downloads). Also on that page is the mapping for my Midi Fighter Pro (which has about 200 downloads).
Here's a demo video: