I really like the netbook I just got but I don't think it's going to work out as a media PC. It's too much effort to plug it in and navigate to get all the stuff you need (well not for me, but for others in my house). So I'm thinking of trying a dedicated box. I'm on the fence of what to go with though.
Apple TV (ok but seems limited to me)
Boxee Box (big contender but I think a net pc might be better with boxee installed)
Roku (cheap and I think might work best, but lacks all of the stuff I might want)
Another option is a Dell Zino HD with one of these mulitmedia keyboards
http://www.newegg.com/Product/Product.aspx?Item=N82E16823176018But the current leader in my mind:
http://www.newegg.com/Product/Product.aspx?Item=N82E16883108321