From Moviefone.com:
The  Weekend (August 20-22, 2010) :
1. ‘The Expendables,’ $16.5 million (3,270 screens), $64.9 million total
2. ‘Vampires Suck,’ $12.2 million (3,233), $18.6 million
3. ‘Eat Pray Love,’ $12.0 million (3,082), $47.1 million
4. ‘Lottery Ticket,’ $11.1 million (1,973), new release
5. ‘The Other Guys,’ $10.1 million (3,472 screens), $88.2 million
6. ‘Piranha 3D,’ $10.0 million (2,470), new release
7. ‘Nanny McPhee Returns,’ $8.3 million (2,784), new release
8. ‘The Switch,’ $8.1 million (2,012), new release
9. ‘Inception,’ $7.7 million (2,401), $261.8 million
10, ‘Scott Pilgrim vs. the World,’ $5.0 million (2,820), $20.7 million

Top 10 movies of summer 2010:
1. ‘Toy Story 3,’ $403.7 million
2. ‘Iron Man 2,’ $312.1 million
3. ‘The Twilight Saga: Eclipse,’ $297.2 million
4. ‘Inception,’ $261.8 million
5. ‘Shrek Forever After,‘ $237.7 million
6. ‘Despicable Me,’ $230.7 million
7. ‘The Karate Kid,‘ $174.9 million
8. ‘Grown Ups,’ $159.0 million
9. ‘The Last Airbender,‘ $130.1 million
10. ‘Salt,’ $109.9 million