@Darth Lucas: I like the idea of different sub-orders within the Jedi hierarchy. Do you think there would be any additional ones besides Knight and Master? I'm thinking that if I "burrowed" (hehe) the idea of various branches of the Jedi lineage, that I would include some never-before-seen kind of Jedi in my prequels to differentiate them from the OT and offer something new...but I would try to make sure it is done in a way that renders them extinct somehow by the events of ANH.

Jedi Knights seem to be the most martial (but at the same time the most diplomatic) kind of light-side Force user. The Dark Side analogue would of course be Darth Vader. They are the business end, the ones who travel around the galaxy and either end wars or (in the case of the Dark Side) start them. A Jedi Knight has been established as a Jedi who can navigate diplomatic/social situations with powers of negotiation (bolstered by the occasional use of the mind trick)...but who is not afraid to pull out a lightsaber and start slicing away enemies, but only if that is an absolute necessity. Sith Knights tend to be more inclined to the combat option than their Jedi counterparts, and even their "diplomacy" usually entails blackmail or intimidation.

Jedi Masters are more cerebral. They never use lightsabers because they are not expected to engage in any sort of combat outside of self-defense (which even Light Side Force powers are supposed to allow, correct?). The Dark Side equivalent of this would appear to be the Emperor, the pre-eminent Sith Master. An individual who considers the Dark Side of the Force as a tool with which to dominate the galaxy.

So what's left? Jedi Navigators who use their powers to more effectively pilot starships through hyperspace? Jedi Alchemists who use their Force abilities to create objects that can imbue a user with special powers of some kind? Jedi Scribes who collect information to fill up Holocrons?