One approach to dust busting is to use the Clone Stamp tool. There's plenty of information on how to use the Clone Stamp tool here.
Another approach is to render and export a sequence of PSD files and just do the work frame by frame in Photoshop. The paint and selection tools in Photoshop are enough easier to work with that this can be worth the extra hassle of moving files back and forth.
i understand the basics of the clone tool. been using shake until now but,
as things move forward, i feel the need to find an alternative as it's no
one thing a tutorial aimed specifically at dust busting would be helpful
with is temporal questions. the example in the link you posted clones part
of an image in an ongoing manner, the image being cloned to all
subsequent frames. i'd like to see how the clone tool is used to clone part
of an image for only the present frame. not sure how the controls would
work and it be helpful to see how to address the temporal question. do i
keyframe? do i need many layers for all the frames? things like that.
Clone Stamp tool's strokes are just like any other paint strokes. You can set their duration to be whatever you like---e.g., one frame. All that you need to know to get started with the paint tools is in this section.
If you've been using Shake, then I'm pretty sure that you're bright enough to read some documentation and get going on your own without a hand-holding tutorial. ;-)