Hi,

Some of you may have heard about the recent results attempting to measure the "speed of gravity." A little background on this is that the speed at which light travels - about 300,000 km/s - is more fundamentally the fastest speed at which information of any kind can travel (as far as we know). So this should include the speed at which information about the gravitational field can propogate. The experiments used the deflection of light from a quasar when it passed close to Jupiter as a way to measure this speed, and found (most importantly) that it was not infinitely fast, and that it is consistent with the speed of light.

Here are a couple of links related to the experiment and the instruments involved:
http://www.aoc.nrao.edu/epo/pr/2003/gravity/
http://www.aoc.nrao.edu/vlba/html/vlbahome/genpublic.html

Todd