There are an amazing number of accessories for Raspberry Pi computers that help you make them even more useful, and this case/touchscreen combination is just one of them. I could imagine using this for a wall-mounted device for a specific use or as a battery powered handheld device for network testing. Even as a simple Raspberry Pi test bed, this would be a cool way to try out the many features of the Pi/ — Douglas
There are a ton of cases on the market for the Raspberry Pi, some even equipped with cooling fans, heatsinks, and even displays. While most of those can be had for reasonably cheap, those equipped with display or touchscreens can run on the expensive side- costing $20 and up depending on the model. Online retailer Banggood is currently selling a Raspberry Pi case that includes a 3.5-inch TFT LCD touchscreen (480 x 320) and a handy stylus for just $16 (plus shipping).
An interesting link found among my daily reading