This page is for mods that I recommend. Mods make MineCraft a whole lot more fun, and are generally easy to install.
DrZhark's Mo' Creatures
Requires ModLoader and AudioMod. This mod adds more creatures to the game.
Single Player Commands. Requires ModLoader. Allows you to use commands in single player.
TooManyItems. Allows you to InvEdit whilst ingame via the inventory. Requires ModLoader.
Plane Mod. Adds planes that run on coal and shoot bullets to the game. You can fly them. Requires ModLoader, AudioMod, and Turbo Model Thingy.
Zeppelin Mod. Allows you to create models that you can pilot/fly.
Airship Mod. Allows you to create and fly airships.
Yogbox. A carefully chosen compilation of good mods.
Millenaire. Creates NPCs and NPC buildings ingame.
Clay Soldier Mod. Let's you craft mini soldiers of warring factions and kit them out. Then you can set them on each other and battle!
Beer Mod. Allows you to grow more crops, and craft beer, beer barrels and more