It brings new technologies that are not supported yet in Internet Explorer 6, 7 and 8 into Internet Explorer. It literally is like running Google Chrome. I highly recommend this plug in, not that I use it, but because I use Google Chrome.
Additional benefits include internet Explorer runs 8 times faster using Google Chrome frame, according to Techworld.
To try Google Chrome Frame, visit the Google Chrome Frame website. Please comment if you have used it.