Quote from the Original Project Page:

This small addon adds the quest's level in front of it's name. Nothing more, nothing less. This isn't done by replacing the whole functions of the quest log. Instead it intercepts the call of the function returning the quests name, level, ... It then prefixes the name with the level. That's all. By doing so, it also works for the built in quest tracker.

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Information:

Updated Version of http://wow.curse.com/downloads/details/5210

Original Project Page: http://wow.curse.com/downloads/details/547

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What's new in 2.8.2:

- Now works with patch 2.3

- Little Fix

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p.s. This AddOn was updated with help. I could never do this alone ;-)