Attention Oblivion addicts! Shivering Isles is ready for download! Major Nelson reports:

Play the official expansion for Oblivion - the 2006 RPG and Game of the Year. Shivering Isles features more than 30 hours of new gameplay as you are sent to explore the realm of Sheogorath, the Daedric Prince of Madness. Shivering Isles adds to the existing world of Oblivion, so you can continue playing with your existing save game/character, or create an all-new character just to explore the new content in Shivering Isles. New Quests, creatures, weapons, armor, ingredients, and more await in the land of Mania and Dementia.

Entry to the Shivering Isles will cost you a cool 2400 MS Points -- $30 US. Isn't that a bit steep? You can get the Windows version for two dollars less on Amazon, and that comes with a box and manual.