Man, lotta information in this thread, and the catfight in the middle totally distracted me from my train of thought.....
1. tarkin doesn't think obi wan was killed in ep III, he says "he must be dead BY NOW"....anakin is his source of information, so therefore anakin doesn't believe obi wan is dead (after the duel)
2. i don't think anakin and obi wan meet again after the duel until ep IV
3. i think anakin must be named vader before the duel, and reveals this to obi wan during the duel, as others have said. I've read things that hint at this i think (maybe pablo, can't remember) but i'd never really sat down and put all the pieces together, so this thread has been quite enlightening for me on that front. (it would be a lot easier for anakin to slaughter jedi children if he was divorced from his previous personality somewhat by then)
4. on cavola's points to do with anakin being hardly done by: there's enough in the films to make us empathise with why anakin acts the way he does, we all have elements like this to our personalities at times. But he is clearly a pain in the ass. he has a tantrum and destroys an entire village, he tells obi wan to get f*****d at every oportunity, and constantly whinges that he doesn't get enough respect, even though the rules of the entire jedi order have been bent to allow him in (he doesn't seem real grateful to be freed either, considering that's against qui gon's job description - it's like he expects special treatment). imagine someone you know who is quite talented, but who tells you so at every oportunity. Imagine talking to your boss or teacher the same way anakin talks to obi wan. If you disagree with someone in authority there are subtle ways to discuss matters, anakin has no diplomacy or social grace.
I could say more but this post is getting too long, and i'm off topic anyway. I am looking forward to rewatching ep I, and seeing that look anakin gives mace in the jedi council scene. Now that we know what's to come.