I've been planning my next media PC now that I have a 1080p screen and I think I'm going to switch to mini-itx. It's small and fanless but has the expansion room I need to additional drives and a blue-ray DVD drive (once the prices drop a bit more)
I'm thinking of this
Jetway Eden C7 series for motherboards
I plan on hiding the case behind a speaker so it
doesn't have to look pretty, it just has to be small. That means that there won't be enough room for a 5.25 optical drive so I'll have to go slimline (slimline blue-ray drives cost a fortune now so I'll use one of my spare DVD-drives until the prices drop). I don't indent on using for HD TV recording at the moment but I needed a case that can fit at least 1 PCI card for a tuner card in the future. Plus it has a power brick rather than an internal PSU (no fans)
For the sake of size, noise and heat I'll probably go with a
solid-state storage option. All the video and audio is being stored on a fileserver in another room so I don't need much more than 8GB anyway - especially if I go with a flavor of linux over WinXP.
No wifi for this box - we already have a gigabit network at home with cat6 run to the living room.
So yah, I'm open to suggestions and comments from those with mini-itx experience. All my HTPCs I've built in the past have been ATX based so it was a constant fight of noise over functionality.