So, for raiding at level 85, you really should be wearing at least an average of ilevel 346 gear, which is the Heroic 5-man gear.You can get gear from the same item level (or better) from additional sources: crafting professions (including Archeology!), bought with Justice Points from vendors in Stormwind or Org, and reputation rewards from various factions.
Here is my caster druid pre-raid gear list for level 85 (both moonkin & resto). I didn’t include many of the craftable items (especially if they were BOP), and I mostly stuck to blues (with only a couple epics highlighted), so I recommend supplementing my guide with some of the others that I linked. It’s also not a Best-in-Slot list, since I included items for both moonkin & resto. Resto also has 2 playstyles for raiding (tank healing values mastery more than AOE/raid healing values mastery).
I made my list of items at least ilevel 346 for you to look for as you gear up for raiding in Cataclysm. You really don’t want to start raiding until you have this level of gear. It’s going to be difficult for you to ding 80 and then step into raids the next day. You will have to gear up in “Normal” 5-man gear to be able to handle running Heroics, and then you have to gear up in “Heroic” 5-man gear to be ready for raids. This is going to be a slower process than it was in Wrath of the Lich King, because they are hoping to slow down the speed at which we rush into the first raid instances. In Beta, they gave us premades with ilevel 346 gear to test the normal-mode raid dungeons, and we pretty much required people to have the premades to raid test. This means that the bosses were tuned around being difficult for people wearing Heroic 5-man gear.
I anticipate that some of the links may point to the wrong items, since there are LOTS of links in the gear list post.
It’s only 1 more week ’til Cataclysm!