Ways not to lock your bike

Very poor technique, if you are going to use one small d lock on frame only you should always go round the headtube, it looks much classier.

I only use one small d-lock ('cos Australia) and I either lock up my front wheel and downtube or rear wheel and seat tube. I'm a big fan of the front wheel and downtube because then your bars can't be turned. Only when I can't be bothered and am only going to be locked up for a few minutes, I'll lock up my head tube. I never lock by top tube only.