How to detect something like this?
Interferometric gravitational wave detectors: the set-up
Light pulses in a gravitational wave detector
Bring on the gravitational wave!
Running interference
And now for something a thousand times more complicated
Pages of the LIGO Scientific Collaboration
You can find some further information about gravitational waves on the Einstein Online website:
Einstein Online: Spotlights on gravitational waves
Update: Gravitational Waves Discovered