I often feel like the only guy here who uses MooTools for my javascript.
It stands for My Object Oriented Tools, mootools.
I really like their take on OOP in javascript. You can use their class implementation along with jquery too, so you don't have to ditch jquery (though mootools does it all just as well).
Anyway, give the first link a good read and see what you think, the second link is to the mootools docs.
MooTools & Inheritance
MooTools Classes
