Use a wye fitting rather than a tee so that less suck is required to move dust.
Clear ducting for dust collection system. - brilliant
Downdraft Sanding Table Box - Learn how to make a simple box that will give you excellent dust collection for sanding your woodworking projects. FixThisBuildThat.com
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Rather than a short radius 90 degree turn, incorporate two 45 degree bends with a section of straight pipe in the middle, which will allow the particles to scream right through the turn.
Adding A Pre-Separator To Your Dust Collection System
#2713 Central Dust Collection - Dust Collection
See there? How cool is THAT? You could disguise that and use it in a traditional room. What is it? It's a "floor sweep". Simply sweep the crap into the box and the dust collector sucks it up.
Chris Billman's Dust Collection Hoods
Organização de Oficina - Aspirador em rede / Using a Shop Vacuum for Dust Collection. Fittings, filters and accessories for turning your shop vacuum into a dust collector.