If you get too aggressive about it, you inevitably end up playing the role (bitter apostate) that the wts has cast for us. If you're not careful, you may actually delay someone's awakening by keeping the apostate phobia strong. The only way any apostate information will ever take hold is if it is presented in a non-threatening way. There are few ways to do that better than to just put it up online and let the doubters find it themselves. Of we remain passive, everytime the WT has an article about bitter apostates it will stir up doubts because it won't line up with their experience.
That said, I think simple signs (I.e. ones with only www.jwfacts.com written on them) might work since it plants a small seed that can eventual come to fruition in private. Additionally, I try to play a small role by never directly going in the name for sites like this, instead I use Google to get to it, which can improve the rankings and get the sites a little more visibility.
The public in-your-face campaigns handing out leaflets at conventions will probably never have great success because even a jw with huge doubts can't take anything while others are watching.