Eddie, you are SUCH a quick thinker!
I loved that website with all the scams. It really is true that the best strategy is a good defense: carry NO purses, backpacks, daypacks etc. Hide a small amount of money and one credit card on your person. Lock up everything else (and not necessarily in the hotel safe.... remember anchovy front's story????).
I loved Barcelona and saw NONE of the scams in operation, mostly because I was walking to a particular place, was speaking Spanish, etc. We did end up in the barrio chino by accident one night, coming back from a theatre, and I was nervous, but mostly there were just many groups of single men hanging.
Barcelona is a fantastic city!