In January, I upgraded my old 20year old 27" tube tv to a Samsung 46-inch LCD. Upgraded my 5.1 receiver to a 7.1 in order to connect everything via HDMI across the systems. Also got a Cablevision HD-DVR.
Absolutely LOVE IT! The only downside - I can only record 24-ish hours of HD TV. Mind you - prior to this HD-DVR / Cable box, I was using a VCR.
Those of you who have not yet converted to HD tv - you are truly missing out. The picture quality will blow you away.
While not all of the channels are available in HD - but in my opinion, those channels aren't worth watching....
-Z-man.