Jamba - so good
SuperDuperMacro - great for long macros
TotemTimers - totem management
EventHorizon - cool down tracking
PowerAuras - reminds me to keep buffs/debuffs up
Mapster
MiniMapster
Outfitter

Recount
Omen - don't pull aggro!

Grid - party/raid frames
Clique - click-to-cast

rBars - small LUA based bar mod

UnderHood - player unit frame HUD