http://www.woodcraft.com/family.aspx?familyid=4310 ($27.99)
I have these installed at each major source of debris in my little shop. These devices do an excellent job of dividing the larger shavings and chunks of wood from the dust. The dust goes on to the much larger JET 1200 canister vacuum. The METAL trash can is available from Home Depot and is a 30 gallon can. PLASTIC or RUBBER TRASH CANS WILL NOT WORK.
The best part of these little wonders is that it is far, far easier to empty a trash can than to tear down a DC and go throught all that hassel. I empty my DC about 2 times a year and the pre-sorts about every 10 days or so. [
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Since the larger 'stuff' is held out, the possible damages to the DC are avoided. Hits from pieces of wood can and do break impellers in the dust collectors. Wait till you have to repair one of them.