45, 46, and 47 and 61 (maybe 62, it's been so long) are the magic numbers, not many buffs you'll be interested in can be cast on you until then. 45 is when you can get KEI, a mana regen buff. 46 is when you can get virtue, an upgrade of temperance. 47 is when you can receive "Mass Group Buffs," which is an AA that causes the next group buff to be cast affect an area about 50 feet around the caster. Finally, 61/62 (whichever it is) is when you can get any 66+ buffs.
Raid buffed simply refers to the fact that you have all pertinent buffs from all the classes that cast them.
Edited, Wed Jun 7 19:33:01 2006 by Brudish
Edited, Wed Jun 7 19:33:17 2006 by Brudish