I use CTMod, Telo's bufftimer and clock, BuffAhoy and just recently added WOWEcon.com PriceMod.
CTMod - http://www.ctmod.net/downloads.ct
Telo - http://www.wowwiki.com/Telo's_Addons
BuffAhoy (Pally mod) - http://www.curse-gaming.com/mod.php?addid=372
PriceMod - http://www.curse-gaming.com/mod.php?addid=559
Just a quick note on PriceMod, this is by far the most accurate information on prices for items within the WoW community. It provides Vendor and AH prices on all items as it is collected.
CTMod - http://www.ctmod.net/downloads.ct
Telo - http://www.wowwiki.com/Telo's_Addons
BuffAhoy (Pally mod) - http://www.curse-gaming.com/mod.php?addid=372
PriceMod - http://www.curse-gaming.com/mod.php?addid=559
Just a quick note on PriceMod, this is by far the most accurate information on prices for items within the WoW community. It provides Vendor and AH prices on all items as it is collected.