There are a growing number of online employment services that either specialize in telecommuting or have a special telecommuting section. But watch out, some of them are nothing more than scams.

Everything may seem like it’s on the up and up–reasonable salaries, professional website, even a warning to watch out for scams–but when we looked closely we spied something fishy going on.

Our first clue was that the website required you to pay to register. Now what sense does that make? If the site is in the business of finding good employees they can rent to employers, why would the block the road to success with a toll booth?

Other sites don’t charge to join or register, but they do charge a fee to cover their ‘administrative costs’. That’s total bull. All businesses have administrative costs, and those are paid by customers (employers) not employees. Remember, a temp agency charges employers for your work, say $25/hour, and they pay you, say $20/hr. That $5 an hour difference is supposed to cover their costs and also a bit more–that’s called profit.

Our second clue something wasn’t right with some sites was that they charge you before they even look at your resume. If they were serious about getting you work doncha think they’d might be interested in what you can do, even to the extent of testing you on things you claim you can do? ‘Real’ temp agencies certainly do. Temp agencies are very interested in qualified folks because their income depends on an on-going relationship with their clients, your potential employers. If they hire incompetent people their customers will be unhappy and look elsewhere.

The smoking gun clue, though, was the fact that these sites charge employers, their customers, a fee to register. Why would an employer pay a penny before they knew the company had qualified candidates for their job openings?

But don’t get the wrong idea, just because a site doesn’t charge a fee to join doesn’t mean it’s not a scam. The safest bet is to be sure you don’t pay a penny to get a job. Honest employers are happy to pay recruiting and training costs.