[Trerro]

For experienced modders (If you're new to modding, skip to below the dashed line):

Step 1: Update Minecraft to 1.5.2, if it's not already there.
Step 2: Install the current version of Forge Modloader. Don't forget to delete META-INF. You may want to run the game to make sure it's working thus far.
Step 3: Add all 3 of the mods we're using to your mods folder.

And that's it, you're good to go.

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Full directions:
Step 1: Update Minecraft to 1.5.2. You should be automatically promoted to do so on load, simply click yes and let it do its thing.
Step 2: You'll need to install Forge Modloader. Here's how:
-Download it from http://files.minecraftforge.net/ (the "universal" link). The exact version you grab isn't terribly important, I'd recommend the highest one on that giant list that's listed as being for 1.5.2, though in theory, any newer version will work too.
-Open your Appdata folder...
--XP: Start->run->%appdata%
--7: Start->Type %appdata% in your search box
-In .minecraft/bin you'll see minecraft.jar. Open this with WinRAR. (rarlab.com if for some reason you don't have that.)
-Also open the FML .rar with WinRar
-Drag and drop everything from FML into your Minecraft jar.
-Delete META-INF from the Minecraft jar.
-Run the game. You should get a popup from FML as it runs its initial setup. If nothing fails, you're good.

Step 3: Install the 3 mods we're using.
This is actually quite simple. In %appdata%/.minecraft is a folder named Mods. Simply dump all 3 mod files into there, and you're done - no need to extract or modify them in any way. The 3 mod links are:
http://www.minecraftforum.net/topic/1585216-thaumcraft-305c-updated-2152013/
http://www.minecraftforum.net/topic/1680480-15xforgesmp-bibliocraft-v123-bookcases-armor-stands-shelves-printing-presses-redstone-books-and-more-updated-05152013/
http://www.minecraftforum.net/topic/561673-152-the-twilight-forest-v1180-naga-updates-more/
http://chaoscluster.com/misccrap/ChaosCreeper.rar

[Sonya the fox]

http://chaoscluster.com/misccrap/ChaosCreeper.rar

This is because the mods are still being updated some, and if you use a newer version than the server you will not be able to connect.  Inside this rar is a copy of all three mods and the most recent forge as of the time of creation.