More Fraction Multiplication

My 7th grade students are in the middle of exploring fractions.  They are currently researching the question:

What are fractions and how can I add, subtract, multiply and divide them?

I'm not sure how much instruction I want to give here. Is this intuitive? What can I do to make this more usable?

 Applet with more instruction is here.

Update
John Golden:

@dcox21 @danielpearcy worth letting students adjust estimate afterfirst fraction is shown?
— John Golden (@mathhombre) November 8, 2012

Good idea.  Updated version.

Please Wu, Don't Hurt 'Em

Yes, this is a mission that Wu's on—taking out the weak.

Hung-Hsi Wu

[Textbook School Math] gives students (and teachers) a gimmick; the CCSMS require that students actually learn mathematics.

You can't touch this.