Removing dust from open stand / bench MB?

OK, so I've run my PC as an open stand / bench type rig for a while.
Horizontal mobo, nothing above it to protect it from the dust.
Now I am planning to move it back into a case, and I want a nice and neat setup without dust.
The question is, what's the best way to clean up all the dust? There is also some between various components, and there may be actually some inside slots as well, not sure how to efficiently clean it up...
Thoughts, help, suggestions? :)

Compressed air.

http://www.veiled-chameleon.com/webl...ressed-air.jpg

Use compressed air and a horse hair brush. Or just run it under the sink and scrub it with a tooth brush. Worked for me!