In version 1.5.1 fixed bugs and crashes version 1.5. It is compatible with 1.5 servers

ModLoader — modification installer mods to the client side of the game, you want to work with most small mods. This mod is outdated and not been updated with version 1.6.2. Also it is not compatible with Minecraft Forge

The most pressing question for beginners is how to install mods in Minecraft? At the moment the process of installing mods for new versions much easier and to the credit of Forge and Liteloader.