Yellow cake (edible) was a favorite of mine, made by my grandmother years ago. Thanks for the recipe.

Yellowcake is NOT depleted uranium, but a stage in refining the ore, with impurities removed. See post above.
The source of that found in Iraq has not been announced, and may not be known; several countries could have provided it. The U. S. had transferred it to safe containers before moving it, perhaps the old corroded ones had labels.

No, of little immediate use to Saddam Hussein, except for a planned concentration program. He would have had to buy the large centrifuges and collector equipment to do that with, and there is no evidence so far that he ever obtained it. The technology is simple and known to any number of chemists and physicists.

But, as posted by bearded Bruce, at this date signifying nothing of real importance.