It's pretty much official that Revenge of the Sith is a box office smash. Over the first 4 days (Thursday-Sunday) it grossed $158,449,700 according to the article above. It grossed over $50,000,000 in its first 24 hours! It also grossed another $144,000,000 worldwide taking it's total 4-day gross to just over $300,000,000.
Thinking back, one of the most hyped movies last year was Fahrenheit 9/11. It's total worldwide gross after all was said and done, according to the above link, was $222,446,320 with $119,194,771 coming domestically bringing in $23,920,637 opening weekend. This movie, hoped to be the "chosen" movie to "bring balance" for the DNC, was hyped as being the highest-grossing documentary ever with the highest grossing opening weekend (though it's possible that Jackass: The Movie [a TRUE documentary] grossed more than Fahrenheit).
All that said, a measly sci-fi flick doubled the FH's opening weekend in just 12 hours and has far surpassed FH's worldwide final talley in the Sith's opening weekend.
Funny how insignificant Fahrenheit 9/11 was in retrospect...