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I just got a 50" Sony 3LCD Rear-Projection TV but I haven't taken it out of the bo yet so I can't tell you if I like it or not.

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I've owned this TV (Sony KDF-E50A10) for a couple months now - it's good, not great. How much you're willing to spend is a big factor. I spent about $2400 on this TV (+5 year extended warranty) from some random online store in Brooklyn. It was basically between that and the 50" Panasonic plasma. There was no question when I did side-by-side comparisons in Sears that the plasma's picture blew the Sony's picture away. But, the plasma ran up around $3500, and I didn't want to spend that much. I haven't seen any Sony SXRD's in person, but they're supposed to be amazing (true 1920x1080 HD resolution, whereas the LCD is 1280x720 or something and the plasma is 1366x768? this is off the top of my head but the #s are somewhere around there) and only slightly more expensive than plasma.

AVSForum is a great resource. I did a lot of research there.