Motherboards - The Designing Process @ MBReview

"Yet another important topic that must be addressed by designers is the tuning of the high speed interconnect traces, such as the front side bus connections running from the CPU socket pins to the MCH pins. If you take a look at either the top or bottom layer of a motherboard, you’ll notice that many of the traces do not follow a straight line path, rather they seem to snake around. Some traces do go in a straight line, while a trace next to it might twist and turn. This is referred to as “serpentining” for obvious reasons."
Some of these serpentining traces are so they will fit while others are designed to act as capacitors.

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