I fixed my cruise today! This summer I replaced my broken stock 3rd brake light with a LED replacement. The cruise control requires a certain amount of resistance in the brake circuit and because LED are very low current it confused the cruise control.
I added a resistor made for LED automotive lighting and now my cruise works again!
2002 Ford Focus ZX5 2.0 Zetec MTX
2003 Ford Escape 3.0 Duratec