I have no idea if this is possible to even do at the moment, so if not, i apologize.
A few years back when I played WoW, one of my favorite addons was one that would show how much exp you have, how much to level, exp per hour (or minute), how much time until you level at the current rate, and how many mobs you must kill until you level.
I did a search on the forums and didn't see something like this posted, but that doesn't mean I did the search right.
This isn't the addon that I used before, but something like this:
http://www.wowinterface.com/download...nceBroker.html
Thank you (even if you just say it's not possible yet)