For those of you interested in building your own wireless water cannon powered by Raspberry Pi, you might be interested in the new Water Gun Kit created by Joe Hoskisson based in Salt Lake City.
The kit comes almost ready for your use and provides educational introduction to electronics and robotic programming for children aged 12 and above. The water gun is battery powered and wireless which allows it be placed it in strategic positions. You can pivot it left an right with the touch of a button and make it squirt by pressing space bar.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!