Using the Arduino for proects. simplest lately was to project a simple web page so that I could take down the internal web server without the users not knowing what was going on. Sort of an under construction page is delivered. Next project is to interface an old composite monitor and use it for displaying messages that can be updated via ethernet remotely.
Installed adosbox on the Nexus 7. Running a lot of my old qbasic programs such as a spreadsheet on it. Not gui, but sure is practical...