Kitco is a Canadian company, and has been in the precious metals business since 1977 - they're one of only six international approved agents for the Perth Mint (owned by the Western Australian government), so I have no doubts as to their legitimacy.
I do have questions though about whether their pool accounts are insured or assured in any way, and if anyone has trading experience using them - things like ease of use, anyone ever had problems redeeming, etc. Google didn't turn up anything nasty, but I would like to hear from anyone who might happen to be an account holder there.