Totally Raiding Inc.

Right, here's the laundry list of things you need to do to apply to TRI:

First, register. You'll need it to finish the process. A moderator should approve your application in a fairly timely fashion, unless you apply at some ungodly hour.

Next, read this list of very long posts. No, there's not a quiz at the end so you could skip it, but I guarantee it will end up biting you in the ass, particularly if you skip the parts about loot and addons.

Who we are: http://www.totallyraiding.com/forum/viewtopic.php?f=42&t=1519
What we do: http://www.totallyraiding.com/forum/viewtopic.php?f=42&t=2375
What to bring: http://totallyraiding.com/forum/viewtopic.php?f=46&t=2013
What you get: http://www.totallyraiding.com/forum/viewtopic.php?f=42&t=2376

Then, if you still feel like TRI is for you, you fill out an application and post it as a separate thread on the T25 Recruitment boards. The title should be [Name], [Class/Spec]. Format as follows:

Your character's name, with an armory link
The class/role you plan on filling. If you have a raid-worthy offspec, you can also list it here.
A brief description of your raiding experience. We're primarily interested in what you've seen and done in WotLK.
Why do you want to raid with TRI?
What would you bring to TRI, both as a raid and as a community, if you were to join us?
Should you desire, you may also include a description of your character.

At this point, you will likely be contacted by an officer, either ingame if you are on Feathermoon, or via PMs if you are not.