It looks as though Thermaltake's website has been hacked by someone going by the name "alerthack." It's not exactly clear what the motive behind the hacking is, but perhaps it is a disgruntled customer who is upset with Thermaltake over a product that has failed or someone dissatisfied with a Thermaltake product.
As you can see in the picture above, the hacker has left his(her?) mark all over the Thermaltake Global website. Changes include the links on the top, text over the side bar, and a large image near the top. It looks to be a strictly defacing hack, so I doubt there is any worry of leaked passwords or any other security issues.
We may never know the hacker behind it, and it's probably not that important anyway, as a defacing isn't that big of a deal. However, one thought comes to mind--Thermaltake could be pulling another one of its crazy PR stunts, though I'm not sure what they would be trying to accomplish with this if it is in fact a PR stunt.