Refresh rate facts???

...look at the difference between the two technologies, plasma & LCD.
The '600MHz' rating you see on the Panny plasmas should not be compared to the 60MHz/120/240/8 million times the diameter of the earth (MHz) ratings on an LCD. The 600MHz is used for marketing purposes on the plasmas, FWIW. Plasma technology is generally a better choice for fast action. More info:

http://en.wikipedia.org/wiki/Refresh_rate

http://reviews.cnet.com/4520-6449_7-6792632-1.html

http://www.lcdtvbuyingguide.com/lcdtv-plasmavslcd.shtml

Refresh rate is term that is only relevant for various forms of LCD. The refresh rate refer to how many times per second the on-screen images are re-drawn. All LCD have a native rate in multiples of 60 (ie 60, 120, 240). The faster rates exist to help combat motion blur (where fast moving images loose their edge detail and appear blurry), that is a side-effect of how LCD technology works. There are many different implementation of 120Hz refresh, some better than others; Samsung and Sony are generally consider to have the best implementations.

The 600Hz reference with Plasma, has nothing to do with correcting motion blur. The technique manipulates the 60 frames per second that is feed to a plasma HDTV, and re-ignites that gases that produce the images on a plasma display progressive over ten steps. The math, 60 frames x 10 progressive steps equals 600. Fun with numbers! Plasma displays don't refresh the screen; if an image on screen doesn't change for a period of time with a plasma display, the image is not re-drawn from frame to frame like an LCD. This is the reasons that plasma can suffer from image retention.