what addons do you use

i was wondering what addons we all use and why, might be nice to know & an easy way to find out what helps who.

mine are:
grid & gridmanabars (party & raid frames for hp & mp of everyone, alot of options like incoming heals, what buffs someone has, debuffs 2, agro ...)
omen (threat meter, to be able to view if someone goes over & heal them or if tank dies)
recount (dmg meter)
power auras classic (i love this, you can make new spellwarnings to appear on your screen like lightwell off cooldown or you have this debuff (good for bosses))
forte (short spell cooldown timer)
deadly boss mods

thx in advance for info or remarks

on my priest I use : *DBM
*Omen
*voodoo(kinda the same as healbot)
*DPS meter thingy

and that's about it, I do not use bartender, I like the normal actionbars :p