This was reported back eight months ago and is supposedly behind us. I will attempt to get an update, but they sent an email alert out in October, then sent this at the end of the month (Oct 22, 2009)
HDtracks News
HDtracks has implemented new security features in our store. We are proud to now feature the TrustGuard Seal, as well as employing the same security software that secures some of the world's most sensitive websites including financial institutions, e-commerce websites, universities, government agencies and many other e-businesses. If you are paying by credit card, at check-out you will be asked to re-enter your credit card information. HDtracks does not store your credit card information, that information is kept for processing by our accredited credit card processing company only.
Obviously, like all online transactions you need to be careful and check your statement regularly. Also, Paypal (what I use) is a viable option for those who don't want to give cc info online.