As video editor Geoff Morrison's piece explains, part of the blur perception comes from the fact that, on standard LCDs, frames are frozen on the screen for 1/60th of a second, and then abruptly shift to the next frame. This is called "sample and hold." Other technologies like plasma and DLP don't hold the frame for that whole 1/60th of a second, but pulse from one frame to the next, with some healthy downtime. The obvious solution is to double the frame rate to 120Hz.
One 120Hz method simulates the other TV technologies by introducing that downtime. Between each bright frame is a frame that's totally black or very dim (as shown above). The rapid succession of bright and dark frames, 120 times per second, looks smooth to the eye, and keeps some of the LCD's issues hidden in the darkness. This technique is the best, according to Morrison. Alas, it is dying out.
If you're worried about image blur, get a plasma or DLP. I don't really notice blur on my LCD's which are not 120hz.