Nancy Bush has compiled sock patterns inspired by her various travelling experiences. The patterns are not based on one particular style, and this variety is pleasing. However (and this is no problem, simply an observation), Estonian traditional influence is very strong.
There are uni-coloured socks, two-coloured socks, striped socks, lace socks, cabled socks...Some are knit in worsted or DK weight, others in fingering. She specifies what yarn she used for the model socks but also gives generic weights and measurements. She also brings in some new knitting techniques like the Latvian twist and some decorative Estonian braids that I'd never heard of (but later discovered them in her previous book Folk Knitting in Estonia).
One of my complaints echoes that of another review: the photographs were often badly lit, and why make complex patterns in dark yarn that shows off the design very poorly? To remedy this deficiency, Interweave Press has put out some new photos (I think they're on the Interweave errata page) so you can get a better idea of how the finished socks look. I have also seen some of the multi-coloured socks done in different colourways, which are also very effective.
Sometimes the sock (like the Whidby and New England patterns) has a design on its instep, but it is only photographed from the side. This means that you will have to rely on the graphs to figure out how the finished sock will look in its entirety.
All in all, I like this book a lot. If nothing else, it's eye candy. I'm not sure if I'd recommend it to a truly beginning sock knitter but it will definitely inspire you.