With a Silver membership, you have the ability to browse through the different downloadable content in the library, including additional tracks for music games, Xbox Live Arcade titles, and downloadable videos through the Zune Marketplace.
As far as graphics are concerned, they are not as impressive as those you will find on the Xbox 360 or PlayStation 3 video game systems, but its simplicity is appealing to an audience not looking for overly complicated or violent games.
The N64 version got away with a lot more expletives than the Xbox version.
Outside of the official sequels in the Guitar Hero for Xbox franchise, Activision and Neversoft have produced a number of additional titles that are either centered around specific bands or provide an expanded set list for players to enjoy.
I think there will be at least 2 more orders as my fellow Xbox owners seem to be extremely envious.