Sharps says the brightest because they've combined their Quattron tech with their X-Gen LCD panel.
The other standout feature is the 3D glasses. Two pairs come in the box, and they have a special 2D mode, so people who don't enjoy three-dimensional chicanery can watch Toy Story 3 in 2D while the rest of the family sees it in 3D. Right now, Sharp's the only one offering it, but how it works is so simple, everyone else is just gonna copy it: The active shutter is only synced to deliver the left-eye image, so there's no 3D effect.
In terms of notable services, the sets come with Vudu and Netflix. It'll actually convert 2D streaming content into 3D, so you can view The Godfather how Coppola never intended. It doesn't have Wi-Fi built in, but the dongle comes with the set, which it should, for the money. The 52-inch set's $4200 and the 60-inch set is $5300. [Sharp]