I should clarify that I purchased Oblivion for the PC.
The DLC for the pc are only available from Steam at the moment. Gstaff recently posted "Presently, the Deluxe Editions of Oblivion on Steam and Direct 2 Drive are the best ways to get this content."
Yep, I read that. My point is, I purchased the 5th Anniversary edition, and would like to have the add-ins. I have no intentions of purchasing the game twice, and I don't want Steam on my computer. Why offer the Anniversary edition at all if Bethesda wants to drive sales of Oblivion to Steam?