Thanks for the compliment, but since you posted as "w3c" and link to a service you offer called W3C Validation, it looks to me like you are engaging in two rather dirty business practices:
1. Presenting yourselves as the true W3C, both in your Google name and in the name of your company/service;
2. Using this blog to post a comment that does nothing more than link back to your own service for link-building initiatives.
Since the true W3C hasn't yet gone after you for copyright infringement, I won't delete your comment immediately. I'll give you a few hours to respond before I clear it off this blog, leaving this comment in place as a reminder to people that just because a company calls itself "W3C Validation," doesn't mean that it is an official W3C entity and that it is most likely relying on the confusion of users to profit on the good name of the W3C.