Oh, there are more elaborate ones in Melbourne. I should put up a proper photo gallery sometime of the ones inside the Public Bar, or the pasted-on paper art on derelict shop windows.
Tony's had a few good pics up recently... http://www.tamesapien.com/weblog/archives/2004/06/20/sunday-bloody-sunday/
looks cool, but not on par with the kind of stencil thoughtcrime you can see in walls here in porto. i really ought to take my camera out more.