Even if you're not on Dae's guild, you'd still find plenty of useful addons, and we mean it when we say plenty, included in this compilation for World of Warcraft.

Addons are, simply put, programs written in Blizzard's version of LUA scripting. Installing these addons are very easy. All you have to do is make sure that it actually goes and is inside a folder. You want to double click through any folder named "interface" or "addons" in the zip files, but makes sure the included files are in a folder.

Further explanation for addon installation is provided in the read me text file, along with an impressive explanation of each and every addon he has included in this compilation.