I've had a
Roku for about a year now... cheaper than Boxee.
Love it. I have mine running on my wireless network, HD output (plus all others)...tons of channels and any time a internet channel is launched, Roku will have it. Great user-supported forums and developers. Lots of free content.
If the NFL ever puts out a "cheap" internet video option to buy any/all games, then I can seriously see myself getting rid of DirecTV because NHL.com and MLB.com are already streaming. A person can watch most every network show they want with HuluPlus or Amazon Gold...of course Netflix is supported...it doesn't take a math wiz to figure the costs of all those channels for a year is still less than 6 months of my current DirecTV bill...
I have only one Roku box now, but I know I will be buying additional ones as I upgrade my TV's throughout the house.
Most Radio Shacks carry the mid-tiered Roku ($80 I think) and that is the one I got.