Also don't always believe the pay rates displayed on the web sites either. I've SUBSTANCIALLY increased my pay rate from what was advertised on the site. Change a few housing and travel preferences around (you can do that on-line now!) and you can usually get more than you expected without living out of a paper bag either. I used to work in retail and in retail, you can buffer your price so that the customer/salesman has "wiggle room". The customer walks away thinking they got a better deal below advertised price and the salesman still makes their commission. Ahh... Captialism at it's finest!
I agree. There are just too many places out there that openly advertise their positions either on the web or over the phone for you to deal with a company that doesn't. With the web-based ones, you don't even need to register or anything, just view thier assignments and if they're a match, move forward with the paperwork.