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In Form, you can use a layer map to disperse the paritcle grid.
Take a black solid and a white solid and animate a mask to wipe between them (or just use the wipe effect). Precomp the two solids and use the result in Form's layer maps for dispersion. This wipe will break the particle grid apart in a sweeping motion. A more elaborate or custom transition could yield a smokey or dusty look.
You can also use the Shatter plugin with a very high Repetition setting and animated Force Centre to simulate a layer breaking into chunky dust. Add some compound blur to enhance the effect.
Should be easily doable in Form. As Timothy mentioned, use a dispersion map (a gradient in a pre-comp whose position you animate) to determine the particles affected by the scattering, then play with the Fractal Field settings for that wavy/ whispy look. You may of course not get there in one step and will have to use a slightly adjusted duplicate of your particle comp as a matte on the original source layer, but it's absolutely possible.
Thanks for the help.. I am getting closer, but I think I still need a few more instructions..
The main thing I am missing now is Gravity.. I've got the photo breaking into particles as I wanted, but once the particles desperse, they stay static. How can I make them all fall down as if they are reacting to gravity as they are breaking up??
Ok, I was able to simulate gravity using the spherical field...
I'm sure I'll be back soon with some more questions...