I'm thinking this 3D thing may be here to stay. This past weekend saw a new 3D flick push a slightly older one out of the top spot, and there's yet another being released this week. Last week's other new release, Hot Tub Time Machine, slid into third with a modest take. Here's the top five:

1. How to Train Your Dragon: $43.7 million
2. Alice in Wonderland: $17.7 million
3. Hot Tub Time Machine: $14 million
4. The Bounty Hunter: $12 million
5. Diary of a Wimpy Kid: $10.1 million

Here's our three new releases for the week:

Clash of the Titans
What's It All About:
Epic fantasy set in ancient Greece with Perseus, descended from the gods but raised by humans, embarking upon a dangerous mission to prevent Hades from overthrowing Zeus.
Why It Might Do Well:
People do love the 3D, the monsters look pretty cool and having Liam Neeson and Ralph Fiennes in the cast can't hurt.
Why It Might Not Do Well: Rottentomatoes.com gives this an 18% fresh rating. Ouch.
Number of Theaters: 3,600
Prediction: $68 million

The Last Song (Opening on Wednesday)
What's It All About:
In this drama from the author of The Notebook, Miley Cyrus plays a teen who spends the summer getting reacquainted with her father in the wake of her parent's divorce.
Why It Might Do Well: Cyrus has a screen presence that may outlive her teeny-bopper image, and Greg Kinnear is a good choice for playing the Dad.
Why It Might Not Do Well: Many of the kids in Miley Cyrus's fan base may find that this departure from the norm isn't their cup of tea, and the phrase "from the author of The Notebook" should keep a lot of men out of the theater. .
Number of Theaters: 2,500
Prediction: $14 million