Im using:
Forte Warlock (lots of functions for warlocks in party or raid)
Fubar panel (its like titan panel but better), with lots of addons
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OneBag, OneBank, OneView for all my chars, makes it possible to see every chars bags and bank
Skinner, changes the look of almost all windows
Clearfont2, addon that changes fonts and fontsizes
AuldLangSyne, keeping track of friends and guild for all chars, synchronising between them
Bartender3, flexible buttons/bars
Historian, keeps track of stupid things, like how many times i have jumped
Dr. Damage, presenting my average damage as numbers on my buttons
Autobar, keeps my food and drinks in healthy shape
cyCircled, changes size and colors on my buttons
Elkano buffbar, prettier than Blizzard
Aloft, nameplate addon
Armory, an addon to save all your chars characterscreens
Crafttimer, keeping track on your transmutes, shadowcloth etc
eepanels2, really nice to make backgrounds and divide ure screen in different parts
Recount, damage/healing meter, with graphs etc
Prat, chat addon
Cartographer , map addon
Chinchilla, minimap addon
Lightheaded, quest log addon, showing all comments from Wowhead.com
Miks Scrolling battle text,
MIniChat, minimizes chat when not used in x sec
Mobinfo, mob database shown in tooltip
Perl Classic User frames
Postal, mail addon
Tinytip. tooltip addon
and some others aswell, will post addon websites later