I’d check this out but I’m busy waiting for today’s mail. The 3 million dollar check from a Nigerian king’s widow is supposed to arrive today!
Actually, Rat Race Rebellion is a legit site that screens the jobs before they post them. Many people have found work through them, and they have several posts on how to avoid scams.
Some of the jobs they post are no longer available, but I haven’t seen anything yet that looks shady. As for idealist.org, I assume they are legit since RRR links to them. As always, though, you have to be careful online.