I have to imagine Sandra Bullock is in a pretty good mood since The Proposal gave her the strongest opening weekend of her career. Year One got off to a so-so start, with holdovers The Hangover and Up forcing the prehistoric comedy into fourth place. Here's the top five:

1. The Proposal: $33.6 million
2. The Hangover: $26.7 million
3. Up: $23.4 million
4. Year One: $19.6 million
5. The Taking of Pelham 1 2 3: $12 million

Two wildly different movie coming out this week:

My Sister's Keeper
What's It All About:
When a young girl (Abigail Breslin) learns she was conceived to create a compatible bone marrow donor for her ailing sister she sues her parents for emancipation.
Why It Might Do Well:
This is a smart bit of counter programming since the audience for this movie will probably not intersect with the Transformers crowd. Right now there's a 100% rating at Rottentomatoes.com, though only five reviews are in.
Why It Might Not Do Well: The plot seems pretty heavy for a Summer release.
Number of Theaters: 2,600
Prediction: $9 million

Transformers: Revenge of the Fallen (Opens Wednesday)
What's It All About:
Michael Bay directs this big budget special effects sequel about giant alien robots using Earth as their battlefield. Much of the original cast returns including Shia LaBeouf and Megan Fox.
Why It Might Do Well: In addition to having all the effects, action and explosions a Summer blockbuster requires, the first film in the franchise had a $70 million opening weekend and went on to gross $319 million domestically.
Why It Might Not Do Well: A lowly 22% at Rottentomatoes.com.
Number of Theaters: 4,000
Prediction: $98 million