Summit                                  (Nice site for the most stuff and recent)
Summits Link Page                 (Don't need to duplicate here)
Discreet                                 (Were you can get GMAX)
Angle Fire                                (Nice info and Links)
Mod Central                                (Nice review and A LOT of links)
Advanced Modders Forum        (Not for everyone)
Thanos Tower                        (Has the NIF Importer)
Lady Moiraine's                        (Lots of things and Stories)
The Elder Scrolls Forum