Anarchy Online: http://www.anarchy-online.com/ - THE BEST MMORPG OUT THERE!
AO Universe: http://www.ao-universe.com/ - Great resource for guides, tradeskills, and just anything AO.
Anarchy Online Resources: http://auno.org/ - A very good database to search for items. Better then most others due to the fact that you can leave messages to help others find items. It is also regularly updated.
AOFroobs: http://www.aofroobs.com/ - Meet other froobs who aren't within the organization.
AoRK: http://wiki.flw.nu/tiki-index.php?page=Atlas+of+Rubi-Ka - Most up-to-date map of Rubi-Ka.
Mish Buddy: http://www.mmotoolbox.com/index.html - Better then Clicksaver cause its user friendly with more features. It as a help bubble that pops over certain options. Great for the experience and non experienced alike.
Teamspeak: http://www.goteamspeak.com/ - Used for raids and general chat. Helps lessen the org channel traffic. So if you have a mic feel free to download the client.