I think that a personal cinema subforum would be a great adition.
Rage3d certainly has its AIW forum which can be very productive.
Although personal cinema is not 1/1000th as popular, there must be people who buy these things and there's really nowhere they can go to get support from peoeple who have the same Nvidia product.
The other forums are too general and any request for help will get lost.
I just picked up one of these myself for a comparison/contrast and I was looking for such a forum for information.
Maybe the forum could also be for any HTPC applications including TV out and compatibility with TV tuners etc in adition to its focus on personal cinema products.