Here are videos on learning to snowboard by The Snow Pros at PSIA - The Professional Ski Instructors Association
Part 1 - Learn To Snowboard - Equipment Basics
This video covers the equipment basics of snowboarding including boots and the board as well as what to wear
Part 2 - Learn To Snowboard - Basic Movements on the Snow
This video covers basic movements on the snow with the snowboard
Part 3 - Learn To Snowboard - Getting around the Mountain
This video covers how to get around the mountain with your snowboard including how to stop, how to turn and how to ride the chairlift.