my favorite mods...
drdamage - for telling me how much damage abilities do
msbt - mik's scrolling battle text - its scrolling combat text, but nicer! and very configurable.
recount - for lolling at dps that can't beat me on dps.
ct_buffmod - for listing my buffs neatly
ct_unitframes - for giving freindly and informative target-of-target pictures
ora2 - raid related really - spamming invites, MT windows, etc.
dbm - deadly boss mods - for raids mostly, bunch of boss timers and stuff, so i dont have to time enrage timers and such myself.
omen - threat monitor
hmmm... sure there should be more than that
i'll have a quick look when i get home, don't think i've missed anything too important though.
did use talented and closetgnome/itemrack, but no need with the new char sheet and talent improvements in the native ui.