Other
Paul's Garden World: The Science of Composting
Very thorough description of different organisms involved in decomposing organic material through composting. Includes actinomycetes, bacteria, fungi, and a variety of macro-organisms which also function as decomposers. Also discusses...
MadSci Network
Mad Sci Network: Three Decomposers
The MadSci Network answers the posted question by describing three large groups of decomposers: bacteria, fungi and actinomycetes.