Just some quick points (I thought of creating a new thread but they are just small points).
[*]We learn that darkside telekenesis is superior to lightside. Yoda has to focus and rotate a single senate pod, while Palpatine has no trouble throwing three at once IIRC.
I know what you're saying, but that only shows that Palpatine is more powerful in that area than Yoda. But as the most powerful representatives of their force affiliations, that's what we know so far.
[*]With Mace and Palpatine fighting, we get an explaination why ANH between Vader and Obi-Wan doesn't have all the backflips and acrobatics. Although Yoda looks cool doing all those backflips, he loses. Mace won.
Another point to consider... when Obi-Wan and Anakin duel their fight, while fast keeps them standing or walking much of the time (moreso than many prequel era fights), interestingly enough. When Anakin does do a big flip, he gets three limbs cut off at once! The AOTC novel talks about the "force wall" trick, perhaps this is more evidence of it.
So Obi-Wan and Vader aren't necessarily less powerful in ANH, but probably adopted a more conservative fighting style. Yoda fighting style seems to be a weakness anyway -- Yoda is short and needs to do those backflips to get reach.
Lucas specifically called the ANH battle a "hard fight" (on the ANH DVD commentary) for an older man and a crippled old man. It could also be a more careful fight after so many years and so much more to lose. Perhaps...
[*]A few months ago, I suggested that certain force feats required a somatic component, or "moving the hand". Several prominent board members reacted negatively against this. The two points brought out was that "Jedi could have been showing off" and "Vader choked Ozzel". However with ROTS, it is hard to argue that Jedi are merely showing off when they move their hand to use telekenesis. Was Yoda showing off when he was moving his hands, in a fight with Palpatine to the death? Were Vader and Obi-Wan showing off? Besides, Vader only appeared not to move his hand when choking Ozzel. For all we know, his fingers were moving.
Another example would be Vader's fight with Luke on Bespin. Sure he moved his hands during SOME of debris being tossed (or ripped from the walls first) but not all. Could be editing, or could be that not every force power requires a hand movement. Perhaps it has something to do with increasing focus. In the Clone Wars cartoon Anakin moves his robot stump (after his arm is damaged) and channels the force through it just the same. But that's the cartoon, not the movie, so there you go. In CW, the hand gestures are almost pantamime of what they want to happen.
<edit>One more thing -- Since Yoda didn't use the Force to jump up as he was about to fall while clinging with a fingernail, it looks like using Force Jump requires that you be standing on something (unless you believe Yoda's force had been entirely depleted by that point, but Yoda survives the fall which obviously required force).</edit>
This part isn't true, because remember in TPM Obi-Wan was able to Force leap up from hanging on that metal protrusion by his hands in the shaft. Maybe it wasn't "Force Power Jump" but it certainly was a telekinesis spring that moved his body up and over, and without anything under his feet. And Yoda is clearly more powerful than Obi-Wan as a Padawan. So why didn't he do it? I don't know, but that doesn't seem the likely reason.
A lot of Force quirks could possibly be chalked up to Palpatine's "dampening field" theory (the "shroud of the dark side" could be more than just clouding the Jedi's perceptions of the future and Palpatine's true identity as a Sith Lord). But I know that's harder to prove from onscreen evidence...
We finally see what would happen if a Lightsaber impacts Stormtrooper Armor. Pretty much the same as any other material the Jedi routinely slice through...
Other things to consider:
R2D2 spraying "oil" on two Super Battle Droids, causing them to slip and wallow in the puddle, then igniting his thrust jets, causing them to burn and not get up.
Anakin's Scar. Can't they fix a simple scar with plastic surgery? I know they have Luke's face reconstructed in a deleted scene in ESB (to explain real life Mark Hamill's accident and reconstruction), so the tech exists 23-24 years later in the hands of a band of Rebels. Or is Anakin just too proud? Jedi healing techniques not strong enough?
Hyperspace Rings are still in use as of ROTS. They seem to have more "engines" on them, but they're still being used on the Jedi fighters.