Big job sites are warning you to be on the look-out for any job offer that involves money in any way. Don't cash any checks your new 'boss' may tell you to, and then tell you to send them the cash.
Just don't do it. Stick to the well known sites. Monster.com, Indeed.com, and more. Check them out. Be especially careful on Craigslist.
You can also get more info on the scammers by visiting the Federal Trade Commission at: Job Scams
NO MONEY TO ANYONE FOR ANY REASON! Got it? Good. Now, on with the hunt!