Revenge of the Sith

After the crawl, the first shot of the movie pans down to reveal the top of a Jedi cruiser:

This is nearly the opposite of the shots from underneath Star Destroyers that start the movies in the original trilogy.  Instead of the oppression of the Empire, this seems to give the impression of the stability of the Republic, although when the camera follows Obi-Wan and Anakin's ships beyond the cruiser, the battle raging beneath it is revealed.

Later in the movie, there's a shot that's closer to the opening of the original trilogy movies.  A Jedi cruiser flies overhead, but in the opposite direction of the Star Destroyer in A New Hope:

That the shots are becoming more similar illustrates that the events of Revenge of the Sith are leading into those of A New Hope.  There's still a difference, though, because the Jedi are working towards peace and justice in the Republic; they're not yet "all but extinct" in the "dark times" of the Empire, as Obi-Wan tells Luke.

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When Palpatine tells Obi-Wan and Anakin, "Get help.  You're no match for him [Count Dooku]; he's a Sith Lord!" he's still maintaining his façade as chancellor (they don't know that he too is a Sith Lord), but his comment may illustrate his hubris.  As the chancellor, at least, he thinks that a single Sith Lord (and the apprentice, at that) is more powerful than two Jedi.  Luke points out his flaw in Return of the Jedi when he tells him, "Your overconfidence is your weakness."

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When Anakin says, "I'm not the Jedi I should be.  I want more, and I know I shouldn't" in his conversation with Padmé, he turns away while saying, "I know I shouldn't," as if he can't bear to maintain eye contact with her while admitting this fault.

In the featurette titled "The Chosen One" on the bonus DVD, there's even behind the scenes footage of George Lucas directing this scene, and he specifically tells Hayden Christensen, who plays Anakin, to turn away during that line.

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Most of the names of the Sith lords come ultimately from Latin.  Maul is from molere, which means to grind.  Tyrannus is the Latin word for tyrant.  Sidious seems to come from insidious, which is from the Latin insidiae, which means ambush or trickery.  Even Plagueis, who is only mentioned, has a Latinate name; it's similar to plague, which comes from plangere, to beat or to strike.  Vader is the exception.  While it's pronounced differently, vader is the Dutch word for father.

In the same way that Vader's name comes from a different language family, his motivation for becoming a Sith lord is different from the others'.  Sidious's goal is clearly the acquisition and maintaining of power.  ("Unlimited power!")  The motivations of Maul and Tyrannus really aren't explored to a great degree, but they seem similar to Sidious's.

Vader, on the other hand, throws in his lot with Sidious and becomes a Sith lord primarily to save Padmé from his premonitions of her death.  He does want power (over death), but his desire for power isn't a selfish one like Sidious's is.