New Intake Manifold is on and working great. I went with Ford Racing performance improvement.

The manifold cracked because of a build up of gunk in the old coolant/manifold. It had built up around the gaskets of the thermostat housing. When I serviced it, the flush and new coolant broke down all the build up which was plugging the crack in the manifold, right at the gaskets.. after the flush, the gaskets crumbled.

Went in easy, and I highly reccomend AM-Autoparts.com, they have good prices and you can't beat free overnight shipment...