http://www.uesp.net/wiki/Oblivion:Unfinished_Quests
These are all that's left of various old quests that never made it in the game. Seems like a sad sign of how rushed Oblivion may have been.
What I'm wondering is how many of these have been restored? I know that Kragenir's Death Quest brings up something involving the Red Queen.
One quest I'm most interested in is Jirolin Doran's Ogre related quest. It seemed to have the most progress done until it was all scrapped.
Perhaps, one day, I might try my hand at restoring one of these quests, but I'm still inexperienced with much of anything related to script and quest writing so it'll take me time to learn, and I don't want to get in over my head.
I'd also just like to find out if this has already been done before.