I had a couple of concepts as I was experimenting with idea's for RotS;
Not sure if my idea's are even possible, certainly beyond my feeble video editing skills.
Also would love to see Tarkin added, even if it was only for brief cameo's in shots;
At least for me however the full image isn't being displayed you can see it here for a younger Tarkin having been inserted at Palpy's right...
http://i1138.photobucket.com/albums/n534/jonathan_seven/Palpatine_and_Anakinandtarkin.jpg
Just to explain the thinking behind the above concept pictures. Several things always bothered me from the Original Trilogy not really being present in the Prequels.
1. The separation of Anakin and Vader as Characters.
2 The way Obi-Wan describes what happened. Currently he just looks like lair in the OT from the way the prequels are done.
3. Yoda telling Luke not to underestimate the powers of the Emperor or he will suffer his fathers fate.
To me the logical approach to 1. would be to have Anakin and Vader appear as separate characters. My idea was Palpatine could have a private assassin he is using to kill of senior Trade Federation leaders, apparently to bring the war to a quicker close. So we see a masked figure assassinating some of them, following Palpatine's orders (and possibly a Clandestine committee with Tarkin in it).
The last time we see Anakin he would realize that the chancellor is a Sith Lord and goes to confront Palpatine on his own. Palpatine then attacks Anakin with lightning, and that is the last time we see Anakin as Anakin. He's presumed dead - This would also sort of mirror what happens to Luke in RotJ....
Later Vader in mask saves Palpatine from Mace Windu... After that he could finally be officially called "Darth Vader". Anyway the whole point of all that being in ESB, there is a whole "aahhh" moment, and makes what Obi-Wan says about Anakin being consumed by Darth Vader make far more sense. At least with this ordering, Vader in mask would also fight Obi-Wan on Mustafa - which is the bit I'm not sure is even technically possible - and afterwards finalize the transformation from Anakin to Darth Vader.
The other advantage of this is it would save us from some of those horrific Hayden speeches!
Anyways, that was just my idea for the way Anakin should of fallen, while saving the reveal till ESB.