Climber.com
Climber, Warning: Recruiters may think you are uninterested in them if you ever signed up for Climber.com's free service and are not paying for more
Even compared to most job scams, this one seems particularly bad, in that they keep you from finding a job, and you never know why. Climber.com lets you sign up for something for free. If you have ever done so (even if it was in 2007), then they give recruiters the ability to send you messages ...