A good article on night paddling has been posted on Sea Kayaker's website. "Night Paddling" by Craig Jungers covers more than just the lights we need to carry it also gives pointers on how to interpret what you're seeing, as well as some great uses of retroreflective material on your boat and gear. In addition he gives some good stratagies for dealing with shipping lanes that are good advice for night or day paddling.
From the Seakayakermag.com homepage Go to the pull down menu for Education > Online Articles > October 2006 > night paddling.
Sea Kayaker Magazine