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Not necessarily. You may have seen Lost in Space, in which they had invented faster-than-light travel that worked basically on the concept of teleportation, but which needed a device (transported by conventional space travel) at each end to work. This concept could have been adapted into Star Wars.

Of course, Lucas is bending and breaking enough laws of physics, so I suppose I can't focus too much on his unacceptance of the theory of relativity.

Granted, but still something like "Those are the words of a Sith, not a Jedi" would have been a bit more appropriate. Obi-Wan's a powerful enough Jedi to have control of his word choice no matter what mental condition he's in, isn't he?

Off the top of my head, I'd say that a Jedi's body vanishes only when the Jedi died willingly. Obi-Wan raised his lightsaber to give Vader a clean shot so that Luke and Co. would be able to escape without worrying about him. Yoda knew that his time was up and that there was no point in fighting it, so he went willingly as well.

Anakin/Vader, however, wanted his light-side life back, and although he knew that his death was imminent, he wanted to be able to make up with Luke and Leia. Then all the Jedi in Episodes I, II, and III died in combat, where they went out either fighting or being assassinated, therefore they were not ready and willing to go.

Here's a general observation about the entire series: Was Albert Einstein wrong? According to the theory of relativity, time moves slower as a body moves faster, to the point where time stops once light speed is reached. Hyperspace is faster than light ("She'll make point five past light speed," said Han in Episode IV) so shouldn't the relative time of people in hyperspace move backwards? Shouldn't they arrive at their destination younger than when they started?

A friend of mine whose aunt works for LucasArts explained that Lucas' official explanation is something along the lines of "Since it takes place in a galaxy far, far away, the laws of physics from our galaxy don't all apply." What a cop-out explanation for failing to take that concept into consideration.