So, there's good news and there's bad news. The good news is that there is finally a patch for the 360 that will cure many of Oblivion's ills, including:

• Stuttering frame rate
• Clavicus Vile quest bug (game freezes when quest is completed)
• Mystery at Harlun's Watch quest bug (no corpse to find in the cave)

The patch is available for free from the XBox Live Marketplace. The bad news is, it only solves the quest issues if the quests in question haven't been started yet, which just emphasizes how important it is to save the game before accepting any new quests.