Chris Lanier pointed to a new web site called Media Center Components that aims to create a list of components that play nicely with each other. You can upload a system component list (or manually enter the information) and rate your system this is them stored in a database.
It looks like a good idea, when you are buying a new component like a TV card its good to know what works well with Media Center. In fact I had this exact idea back in January and created a forum for Media Center users to post there hardware experiences and I used this information to help me pick a TV card for Vista.
So I hope the site goes well and don’t forget the database on The Digital Lifestyle.com