Just to let you all know, I have finished revising and posting version 4.0 of my Comprehensive Guide to Rapid XP Gain/Debt Loss over on the Guides board on City of Heroes. This is my comprehensive look at powerlevelling, powerdebtclearing, and poweradventuring (non-PL play for most efficient XP gain) in all forms of which I know. I hope people will find it useful.
I’ve had cause to used the techniques for clearing debt any number of times, which is why I’m linking to it, cuz I get tired of explaining the debt-clearing tricks in game all the time.
The rest of it, I don’t know anything about.