With Toshiba pulling out of the HD DVD market, it should come as no surprise that the HD DVD Promotions Group is closing up shop. The group's managing members issued a statement today, announcing that the group is disolving itself and closing its website.
The HD DVD Promotion Group was dissolved as of March 28, 2008, and the website was closed accordingly.

Please access to DVD Forum for HD DVD formats, and DVD Format/Logo Licensing Corporation for format books and its license. Regarding the HD DVD products, please contact each selling agency directly.
If you'd like to read more, the entire statement can be foundhere.