I have two setups.
Traditional PC setup for traditional PC games:
fast PC with 24 inch monitor 1920x1200 with keyboard and mouse.
Comfy couch HTPC:
An older PC in an adjacent closet/room HDMI and USB cables through a hole in the wall to my surround receiver, 50" 720p plasma and USB hub.
Controlled via wired XBox 360 controller and a Logitech DiNovo mini.
Typically I migrate my desktop PC to be my HTPC when it is time to upgrade, with only having to drive a 720p display older HW holds up surprisingly well.
I just upgraded so right now the HTPC is a i5 2500k with a Radeon 6950 so it should be able to handle most everything at 720p.
The DiNovo mini is absolutely fantastic since it is perfectly usable as a thumb keyboard and mouse, but they don't seem to make them anymore and it is starting to go bad.
I have looked around but I have not been able to found any equivalent keyboards that can be used without having it on a surface.
People keep recommending the K400 but it looks to big to be used while holding it. How are you guys using it?