Im using safari on both machines. Every image looks different on the two screens yes. The images on the Macbook screen(which is using the factory profile with the brightness down to about 60-75%, and is BRAND new) look much better to me and im not sure if maybe this is because it is new(the other mac is about 4 years old and hasnt ever been calibrated) or if it's just the glossy screen screwing with me.
Thats why i was wondering how it looks on other peoples monitors since I cant be sure which of mine is more accurate(on one hand I have a glossy screen, and on the other I have a REALLY old screen that hasnt ever been calibrated). My next check is going to a Huey pro and then possibly a second monitor if need be 
EDIT*** After staring at identical images for a while now, I have come to the conclusion that they really arent THAT far apart. With the brightness turned down a bit on my Macbook, the colors are much closer to that of the matte screen on the powerbook, maybe just a TAD contrastier and more saturated, but not nearly as much as it was. When I first looked I must have had the brightness up too high on the macbook.