Like Jake was saying, I've heard numerous people talk about being an air courier but never actually heard of anything following through.
I was checking out the membership prices and if you are serious its only $20 for a year membership. Atleast if it turns out to be a scam you've only lost $20 and you can spread the word its a hoax.
You could talk to WorldWideMike about it, he works for an airline & may have the insider on these kind of companies.
I've been a wild rover for many's the year,
And I've spent all me money on whiskey and beer.
But now I'm returning with gold in great store,
And I never will play the wild rover no more