I mean, come on, Minecraft is where this site really originally came from. It's where our deepest roots are. This is like Remy's Mandatory Minecraft Thread but instead here we talk about Minecraft mods. Ones you like, ones you hate, ones you think would be a good idea to develop, that sort of thing.
One of my favorites is the Custom NPCs Mod from Noppes. http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1278956-custom-npcs
Here's a link to the Custom NPCs Mod's forum page on the Miecraft forums.
So go right ahead, don't be shy, let's talk about Minecraft mods!