I just returned from 4 days in Barcelona. Everyone knows what a great city it is to visit, but many people have related tales of pickpockets. I just want to say that I found a much more evident police presence, particularly in the Ramblas and Bari Gottic, and neither I nor any of the other people I talked while there had had or knew of anyone who had experienced this problem. Which, of course, does not mean that you shouldn't be careful. But, if crime is a significant factor in your trip planning, I would definately upgrade Barcelona compared to how it was just last year.
I spent a week in Barcelona about a year ago and did not experience any problems with pick-pockets. I stayed in Borne and thought it was a pretty tourist friendly area. Just remember to be alert at all times. I suggest carrying your wallet in your front pocket for men, and ladies.. frequently at nightI would bring a small purse and wear it underneath my jacket when out on the streets. Just some tips.