Update Dec 09: With the release of WoW Patch 3.3 and the iLevel gear starting at 219 and 232 for H dungeons, I think the typical level of expected gear has increased. The old Naxx guides are gone. Basically now you’re aiming for 219 in all slots as a start, and any casual with time should be able to get to 232 in almost every location.
That is a huge change from the iLevel 200 items that you got 1 per end boss at the start of Wrath at level 80. Tis a good thing too.
Raiding requirements are popular searches, I know as the raid requirement posts are still some of the most popular in this blog. And to my somewhat shame most of the information I post is a hash of other sources (Alt Doctor, EJ, wiki, etc).
And the Alt Doctor has done it again, posting his Raiding Requirements for Wrath.
If you’re wondering if you are read to run with the big monsters, this set of stats will tell you. Later I’ll review, but for now just read and make sure you know what you need.
If you’re short on some of the stats then check out Wow-loot, WoW Heroes, and BeImba for advice. All are good sources of item/gear advice.