For applications where a no touch interaction with a system makes senses, eg food preparation, warehouse management etc - then the use of the a NUI (Natural User Interface) can be considered.

One version of this is the XBox Kinect controller which can be purchased for around $190.  This control has a USB interface and can be plugged into any Windows7 based PC.

You can the download the Kinect SDK, which includes the drivers for the Kinect - you then have a NUI controller for a Windows7 based application.

You can then using the sample c# code at http://mydsondemand.com/examples - which has the core routines to connect to the onDemand service - simply create an application say that uses the  endpoint methods to interact with the information.

OR write a simple design document and get a freelancer.com c# programmer to build it for you.

The age of integration and cross-mashing via layers of abstraction is here!

Get a backlight projector screen and can even have the image floating... Minority Report style.. :-)

Only minor issue is that the SDK, released a couple of months ago, is currently for personal and experimental use - but can at least put into the design process as  a potential resource.  We are currently talking to Microsoft about their road map to make it available for business use.