As expected, Harry Potter cast an effective spell over moviegoers taking the top spot at the box office and out grossing the series' last installment. Here's the top five:

1. Harry Potter and the Half-Blood Prince: $77.8 million ($158 million for Wednesday through Sunday)
2. Ice Age: Dawn of the Dinosaurs: $17.6 million
3. Transformers: Revenge of the Fallen: $13.7 million
4. Bruno: $8.3 million
5. The Proposal: $8.3 million

This is the first time since the beginning of June that we've had three major releases in a single weekend.

What's It All About:
Produced by Jerry Bruckheimer and directed by Oscar-winning effects artist Hoyt Yeatman, G-Force is a 3-D family comedy about talking guinea pigs working in the field of high tech espionage.
Why It Might Do Well: No doubt this was greenlit after Alvin and the Chipmunks started raking in the dough. If CGI chipmunks can pull in $360 million worldwide then why not guinea pigs? The impressive voice cast, which includes Nicolas Cage, Sam Rockwell, Penelope Cruz, and Tracy Morgan, can only help matters.
Why It Might Not Do Well: Have you ever actually smelled a guinea pig?
Number of Theaters: 3,200
Prediction: $29 million

What's It All About:
Thriller about a couple who adopt a young girl whose sweet and innocent demeanor is covering up much darker tendencies.
Why It Might Do Well: The creepy little kid horror sub-genre has a long history as I mentioned here.
Why It Might Not Do Well:
The notion of a homicidal rug rat may be too disturbing for some.
Number of Theaters:
$14 million