brucie...it's a pretty tricky thing to pin down. Even if it were discovered that it did, the idea of moving solid matter 'real durn fast' has some problems. All I personally expect is to maybe finally hear some 'signal' detected that has been going for thousands of years.

from this page
"Strictly speaking, gravity is not a "force" in general relativity, and a description in terms of speed and direction can be tricky"

also, a newer story... 'speed' of gravity measured