Prokofy Neva and the Second Life Insider are both claiming that the problems we've been experiencing with the grid for the last two days are not the result of internal, technical problems but instead of a concerted attack of griefers at the grid.
The exploit used has been reported already at 12th February 2006 and still remains unfixed. They are claiming it is hard to fix, but hey, after more than a year and it being abused to attack the grid, it is time now to do something against it! Neva claims, that the purpose of those attacks is to make Second Life unusable for good use like the Relay for Life event last weekend. Hm, some logic in it, could be, for sure if it was attack this event could have been a worthwhile target for griefers.
What are the conclusions? We are never going to know, if those problems were a gridwide attack of griefers or not, until the Lindens are going to tell us. Some things are clearly pointing into that direction. But if it was a griefer attack, the Lindens should tell so and don't leave us in the dark about it.