One of my pet peeves is loud computers - I hate them! Silent PC Review is the source for learning how to quiet them down;
the board is also filled with experts on overclocking and computer performance.
Digital photography review has the most extensive and unbiased online reviews of digital cameras.
The public forums provide an additional invaluable resource for enthusiasts confused by the several hundred available models of digital cameras.
Taperssection.com forums contain valuable information on portable recording,
particularly of interest to ethnographers who need to figure out how to navigate the equipment choices in today's market.
Prodigy Group-DIY: The Lab. The one-stop-shop for DIY pro audio projects (I'm currently making a clone of a 1970s API312 mic preamp)