> http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html

The reading and viewing I've done has always suggested that gravity
travels at (or possibly near) the speed of light. As well as trying to
develop methods to detect gravity waves (like Kip Thorne is doing)

http://en.wikipedia.org/wiki/Kip_Thorn

from a supernova, events on magnetars

http://en.wikipedia.org/wiki/Magnetar

may also be a source of measurable gravity waves

In a couple of episodes of The Universe series, it was said that the
gravitational field of a magnetar may be 10^9 that of the Earth, and
a 1mm fracturing quake on the surface of a magnetar would result
in the energy release equivalent to a Richter 32 earthquake (10^12
times the strongest recorded earthquake)

Gravity waves on that scale are enough to repeatedly expand and
compress a planet (and its inhabitants) until even molecules shatter

"instantaneous" is an interesting word in sub-atomic physics. Events
for a photon are without time for example. The relationships between
Newtonian, Einsteinian and quantum physics seem uncomfortable at
times

I think the jury is still out on what gravity actually is. The effects of it
can easily be seen. But why, for instance, can gravity slow photons ?

Maybe they'll find the Higgs Boson, confirm Brane Theory or theorised
tiny quantum universes with our missing gravity (through which presumably
waves would take time to propagate) or turn up something completely
unexpected 

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