1. Julian Beever's Virtual Street Reality is the most interesting street art I've ever seen (link filched from Human Under Construction.)
2. Cybercasso: Chris O'Shea's projects include Cybrid Landscape, and a weblog, Pixelsumo.
3. Three for three: checking out Ruth Gibson and Bruno Martelli's Igloo site led me to Greg Daville's Site to be Destroyed, which led me to his Gifage collection.