If you have a compost pile then you probably know some of the compost is ready sooner than other parts. If you would like to sift through it to get the usable compost without adding the parts that need to finish composting Steve Gerber on Instructables has the solution.
He shows how to build a sifter to sift out the big stuff so you can use your compost sooner.
Trommel Compost Sifter
Yimby Tumbler Composter
Suncast TCB6800 6.5 Cubic Foot Tumbling Composter
Natural Home Stainless Steel Compost Bin
Chef’n EcoCrock Counter Compost Bin