The real news here is that Slashdot articles continue to decline in quality. Hacktivism sounds exciting, but these guys are just script kiddies with a No War sig. Yesterday alone they defaced 296 sites, none of which had any political significance. They happened to find an old PHP application on a backwater NASA website (the Aura Validation Data Center), and they took the opportunity to step up their normal text sig to include a graphic picture.
The only reason that this is newsworthy is because Slashdot made it newsworthy. The greatest impact came not from the script kiddies or their vaguely political scribbles, but the deluge of the Slashdot effect on some poor iMac in Alaska.