both these scripts are fantastic! i doubly appreciate that they are both on the Ukey menu in UV mode.
A couple of notes: Perhaps it is not so obvious on the 3 click that the projection takes on the normal of whatever face you click on for the first click. Also, the texture does not get updated during the clicking if you have subsurf enabled.
I really think you should push to have these either hardcoded into the source or included with the next release. The follow active face script looks like it would be quite useful for things like racing games and images with roads, pipes, or anything that requires a texture to follow a quad path:)