Here are a few mods that I thought you guys should take a look at:
Some of these mods do require Modloader: http://www.minecraftwiki.net/wiki/Mods/Modloader
Mods
Backpacks: http://www.planetminecraft.com/mod/backpack/
Conveyor Belts: http://www.planetminecraft.com/mod/conveyor-belt/
Creatures+: http://www.minecraftforum.net/topic/314680-v037181-creatures-nether-trob-and-treestalker-over-700-downloads-of-trobs/
Rei's Minimap: http://www.minecraftforum.net/topic/482147-18119pre4oct21-reis-minimap-v26/
(Mob) Spawner Gui: http://www.minecraftforum.net/topic/75440-v181-risugamis-mods-everything-updated/
Some of these mods do require Modloader: http://www.minecraftwiki.net/wiki/Mods/Modloader
Mods
Backpacks: http://www.planetminecraft.com/mod/backpack/
Conveyor Belts: http://www.planetminecraft.com/mod/conveyor-belt/
Creatures+: http://www.minecraftforum.net/topic/314680-v037181-creatures-nether-trob-and-treestalker-over-700-downloads-of-trobs/
Rei's Minimap: http://www.minecraftforum.net/topic/482147-18119pre4oct21-reis-minimap-v26/
(Mob) Spawner Gui: http://www.minecraftforum.net/topic/75440-v181-risugamis-mods-everything-updated/