Gameplayer has just played the first two hours of Super Mario Galaxy and were rather blown away by the experience. They believe that it could have the same revolutionary effect on the industry as Super Mario 64, and have detailed their reasoning in this article.
"Imagine 2D Mario is standing at the start of 1-4 in the his side-scrolling days. Now turn the world sideways and into 3D, much like you do in Super Paper Mario. Now knock down the walls and send that platform in an upwards arc, spiraling into a barrel roll before slowly swirling inwards bringing you with each convoluted orbit closer to the planet at the centre of the world, where your enemy resides."