I was just surfing idealist.org’s non-profit job listings which I do from time to time. I haven’t experienced this before but after “previewing” 3 listings, they required me to sign up to view more.

This is bad user experience. It pulled me out of what I was doing, reduced the hits on their website, sent me to my email for a confirmation, and finally led me to blog about the whole experience. I hate being required to sign up for information that really has no reason to be behind a login.