I surfed over to Coolhunting to have a look at their links to some techie Post-it art. Post-its have a key part in technology projects for brainstorming ideas, developing concepts and prototyping processes.
There is a collection of contemporary art installations and nerd pranks here. I came across this posting about Banksy t-shirts. It really surprised at this posting as Banksy's art is about the message rather than being a fashion brand.
Indeed to quote from Banksy's own site: Do you sell t-shirts? i don't make shirts because it would feel like the painting was a guerilla marketing campaign for a fashion label.
Whether he has sold out or not? I don't know, the t-shirts are on sale in the States so there maybe fair use or copyright kinks.