Online Contract Work Web Sites

My friend Pete recently turned me on to a rather large site called Guru.Com that specializes in matching professionals up with companies / employers for contract work. In particular, they have quite a large area specifically for web development / general programming work which I have found to be an excellent resource. I find it interesting though that some US companies are reluctant to work with Canadians even if the job does not require on-site work. Now I can understand if the person was say from India where there would be no possibility of them visiting the job site but, in the case of one project I bid on, the job site was about a 5 minute drive from where I live (currently in downtown Windsor, ON across the river from Detroit, MI) Its strange really because I do qualify under NAFTA to work in the US as a System Analayst and would only require a short letter of sponsorship for employment.

It is what it is I guess.