1) Single-Ended signaling

2) Differential Signaling

"Squiggly Traces" are actually know as Serpentine Traces. These wires are often used to make traces the same length. In high speed signaling, especially when using differential signaling ( http://en.wikipedia.org/wiki/Differential_signaling ). Differential signaling requires the signals arrive at the same time. Take a look at this Sparkfun Forum talking about what they are with a example picture: http://forum.sparkfun.com/viewtopic.php?f=20&t=29396

when differential signaling was first introduced you could not mix se and hvd devices because of the high voltage used in the hvd. since then a new signaling called lvd is used and it will allow you to use a se if you use the lvd/se mode.( p.1008 managing and maintaining your PC 5th edition)

non associated signaling

quasi-associated signaling

circuit related signaling

non-circuit-related signaling

Science Signaling was created in 2008.