Edit: Dimensions are back online!
All Anarchy Online Official resources (Website, Forums, RK1 and RK2. RK3 is Gamigo hosted, and so I have no official update on that) seem to have just failed or otherwise crashed.
There has been no warning and no ETA as to when they will again be avaliable. EDIT: Savvis is not to blame. We're currently, totally in the dark. We'll do our best to keep the community informed as much as possible.