The two releases have played musical chairs over the last two weekends, swapping the number one and two spots while the rest of the pack have trailed far behind.
They will face a new challenger this weekend, however, in the form of Sony's psychological thriller Perfect Stranger, which opens in 37 territories day-and-date with North America.
300 has so far amassed $175.5m through Warner Bros Pictures International(WBPI) and the historical action epic is expected to cross $200mwithin the next week if not this weekend.
The drama Blood Diamond has amassed $106.3m for WBPI, crime thrillerThe Departed stands at $157.1m including non-WBPI territories, familyfilm Happy Feet has grossed $184.2m including Roadshow territories,and wartime drama Letters From Iwo Jima has grossed $54.6m.
The romantic comedy Music And Lyrics stands at $78.2m includingRoadshow territories and opens in Russia on Apr 12. Supernaturalhorror release The Reaping has grossed $6.9m from the early stages ofits run.
Universal/UPI's comedy Mr Bean's Holiday has raced past $100m withinthree weekends and should surge towards $125m from its current $105.6mperch.
Universal's crime caper Smokin' Aces has grossed $18.4m to date and opens inMexico and Singapore on Apr 12. Chinese period drama The Curse Of TheGolden Flower opens in the UK through Universal on Apr 13.
Perfect Stranger, a cat-and-mouse tale starring Halle Berry and Bruce Willis, launches through Sony Pictures Releasing International(SPRI) in France on 400 prints on Apr 11, followed by Germany on 400and Australia on 120 on Apr 12.
The thriller has a chance to perform well across the board because ofthe wide recognition of its two stars. It opens on Apr 13 in the UKon 250, Spain on 362, Italy on 300 and Brazil on 150.
Fox International gives the sci-fi thriller Sunshine a big push thisweekend with launches in 22 territories including France on Apr 11,Australia and Russia on April 12, Mexico and Brazil on Apr 13, andJapan on Apr 14. The film stands at $5m so far.
Fox's family title Night At The Museum has amassed $315.1m and comedy TheDevil Wears Prada stands at $200.3m.
Paramount/PPI's thriller Shooter has taken $3.5m from the early stagesof its run and opens in 16 territories including Belgium on Apr 11,Russia on Apr 12, and Spain and the UK on Apr 13.
The thriller Disturbia opens in Australia and New Zealand day-and-datewith North America on Apr 12. Family film Norbit stands at $55.8m.
Buena Vista International (BVI) opens the comedy Wild Hogs, currentlyon $20.6m, in the UK on Apr 13, and horror film Primeval in Australiaon Apr 12.
BVI's animated family film Meet The Robinsons stands at $29.5m while thethriller Deja Vu has grossed $115.8m.