Ken Libbrecht was my undergraduate advisor and I worked in his lab for a couple summers (in fact, growing snowflakes in a tank and measuring their growth rate at different temperatures and humidities - although mine had to be boring perfect hexagons to get accurate measurements).

He's a great guy and a very talented communicator. I would absolutely recommend his book, and his website, http://snowcrystals.com/ , for anyone wanting to see great photos and learn about the science behind them.