I'd like to ask if we can get the McMMO plugin. I'm not sure if we have had it before, I do faintly remember it, but if we did it would've been an older version.
It is a very fun plugin, and adds Leveling, Statistics and Skills to the game, trying to mimic that of various MMOs. It doesn't overload on the RPG elements if that bothers you.
Here's a link to the download if it interests you: http://dev.bukkit.org/server-mods/mcmmo/
McMmo's main function is adding skills to the game. These skills include Mining, Woodcutting, Swords etc.
Each skill can be leveled up - for example if you mine 20 coal you might level up your mining skill. There are also abilities associated with the skills, such as super breaker, for the mining skill, which lets you mine things instantly for 5 seconds, with a configurable cooldown. Here's the link to the wiki if you want to learn about the other skills, and I recommend you do, I only mentioned some of what it has to offer.: http://mcmmo.wikia.com/wiki/McMMO_Wiki
McMMO is completely configurable and there aren't any duplication bugs or ways to abuse it.