Episode 3 deleted scenes and changes
From the Force.net:
And wow, I am surprised. There were a lot of scenes here that I was hoping to see...
6, 7, 8-14, 25, 30, 32, 37-41: FedCruiser scenes cut (Grievous killing Shaak Ti, the Jedi using their lightsabers to escape GG, underwater swim, climb through shaft, many of R2's hangar gags, many Palpatine cliffhangers)
48: Mace greets Palpatine and the Jedi right after the crash-landing
56: Yoda, Obi-Wan and Mace discuss the Dark Side in Yoda's quarters
60: Bail and fellow Senators speak about the Senate
68-69: Obi-Wan tells Padme of his worries about Anakin and that he nows they're in love
71: Meeting with Organa, Mon Mothma and Padme
73: Anakin informs Palpatine that Obi-Wan soon will have Grievous' head
74: Jar Jar greets Anakin at Senate
75: Anakin confronts Padme
76-77: Republic cruiser arrives at Utapau
83: Obi-Wan chooses his lizard, Boga
86: Mace talks to Yoda on Kashyyyk, telling him of his plans to arrest Palpatine
88-89: Padme presents to Palpatine the Senators' petition
93: Utapau windmill
121: "crazy" Yoda and Chewbacca ambush an AT-ST
176: Yoda lands on Dagobah
And also from comingsoon.net:
Revenge of the Sith Changes:
Anyone who has followed the Star Wars prequels knows that George Lucas changes his films up to the last possible minute. (Ask anyone who happened to see an accidentally released Episode I print where Darth Maul fell down the shaft in one piece.) Revenge of the Sith is no exception. Changes are still being made, so if you've already spoiled yourself with the comic or novelization, a source lets us know of a few things you'll find different in the film. Highlight to read spoilers!:
During the childbirth, the lower half of Padme's body is now covered by some device (added digitally). Thus the scene is now inconsistent with what you see in the books, older stills etc...
Padme's last words are changed and her funeral is now even longer. There are more mourners (mostly human) and we see that she holds in her hand that wooden thing Anakin gave her in Episode 1.