Came across this today, a link to a Visual Basic to Arduino tutorial presenting a basic GUI
http://www.martyncurrey.com/arduino-and-visual-basic-part-3-controlling-an-arduino/
I know now we are getting more into smartphone interfaces but that is also covered in this site with bluetooth etc
Full page of other excellent quick links are as follows:
http://www.martyncurrey.com/quick-links/
Enjoy....