Martin Lihs, working on his Master's Thesis at Bauhaus University in Weimar, has developed a modified Wii controller with which one could practice tagging inside on rainy days. As his thesis is not yet complete, full specs have not been made public, but Lihs suggests about the next version that he's
planning to build a new spraycan with more functions and also an advanced software with collaborative spraying option, different caps, different colours…. and maybee different Sprayers make an appointment and create grafitties together: online!
Controllers might be ready for Christmas, but I guess Santa Claus won't bring you one if you've been defacing public property.