Check out the recently launched LightSpeed Cloud iPad app that I did the UX and UI design for.

Read more about it here:
http://www.lightspeedretail.com/blog/2014/05/as-unique-as-your-store-the-new-lightspeed-cloud-for-ipad/

While you're at it check out the app, it's free!
https://itunes.apple.com/us/app/lightspeed-cloud-point-sale/