It's sad to know that the reputation of a good website has been damaged by scammers. Craiglist was really good in its first days but now it seems like it is run over by scammers. I guess this happens when there is poor management.
I wouldn't reply to any job listing there either. I wouldn't post a job ad on craigslist. You just don't know what kind of wacko's there are out there. It's better to be safe than sorry!
I wouldn't respond to any business opportunity on Craigslist, but it is an excellent way to buy goods cheaply. These same goods can be resold at market value with quite a nice profit.