UI design and add-ons for leveling

I found that that post: UI design and add-ons for leveling | No Stock UI has a lot of good generalized tips for laying out your UI in a non-raid situation.   Apart from spending time fishing, most of my recent WoW play has been leveling characters so this is good stuff to think about. I would like to get a few more toons to level cap as there have been rumors of a new expansion coming out in the not-too distant future.    I’m not sure what I’ll do with a bunch of max-level characters but they do provide me with a variety of gameplay options.