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So what is this? This is a small, easy to build, poweramp using the National Semiconductor LM3875 chip - often referred to as a "gainclone".
The board is a complete single-channel poweramp and power supply. All you have to add is a power transformer and a (small) heatsink. Depending on the transformer you choose, output powers up to about 50W are possible.
What makes this board different from the others available? I designed it to be flat - it will easily fit in a 1U rack. The board is a high-quality double sided, through-plated, silver-plated glassfiber type.
New: I have found a cheaper source for the "good" parts, so the standard version has been discontinued.