Remember, these mods are in my opinion and so you may not agree with what i have put.
I also take no ownership over the mods. I am just recommending them.
The Modloader, Audiomod and the model thingy are required to make some of the bigger mods work, if you would like to download them, click this link:
Zeppelin Mod - The Zeppelin mod allows the player to create a custom flying zeppelin! The player can put blocks together to make them look cool and use the new item involved to make the object fly on command using the numpad! (Controls can be changed in the menu.)
The zeppelin moves freely through the world instead of moving through the world grid!
Download - http://www.mediafire.com/?ympqzibsyqf9f2h
Zan's Minimap Mod - A smart mod which add's a small minimap to the top-right side of the screen.
This mod allows you to set waypoint's so you will never be lost again!
Download - http://www.fileplanet.com/219348/210000/fileinfo/Minecraft---Zan's-Minimap-Mod
Millenaire Mod - A good mod which add's many small villages into the game, the village's can be indian or norman.
The villages will offer to buy or sell items to or from the player. Then the items will be put to good use to make the village bigger! the villages will become more fond of you as you sell/buy items from them.
Download - http://www.fileplanet.com/221895/220000/fileinfo/Minecraft---Millenaire-Mod