Melodic Construction during Improvisation

Another very cool article on the idea of forming a contour of the idea in your mind's ear without necessarily having to hear every note of it; also makes reference to the difference between vertical and horizontal considerations when constructing a line. Joe Gilman was trying to explain the same thing to me but without any mention of vertical vs. horizontal hearing.

A whole wealth of jazz improv info here, same website:
The Jazz Improvisation Almanac

Another one here:
The Jazz Improvisation Primer

The internet is an amazing thing.