to get back on topic slightly
I wanted the same thing a couple of months ago. I investigated (briefly) internet enabled TV's and forgot about them straight away as they would cause more problems and frustrations then they solve.
I then looked at DLNA enabled TV's that would let you stream media from a proper computer straight to the TV (wireless if wanted). I discounted it because it looked very tricky to set it up to do everything I wanted (and I'm an IT tech and I work with digital streaming!!) and I couldn't find a solution that would actually work quite as I wanted it to.
I ended up buying a large full HD flatscreen TV and spent the £400 saved in buying either a internet enabled TV or a DLNA enabled TV to buy a powerful small form factor desktop PC with a HDMI output (system only, no monitor) and a wireless keyboard and mouse, the PC now sits in the TV cabinet and it's a great setup for watching Iplayer and the like on a large screen
(one thing I done wrong, I got a plasma screen, if you are going to be using it with the computer a lot get a LCD screen, purely because plasmas suffer from image retention (and eventually screen burn))