Coaching

Stern Stalls
Holding a kayak vertical looks pretty cool and is surprisingly a relatively simple move with a bit of practice. It can lead to move advanced moves such as cartwheels, so it's a good starting point. This article discusses the stern-stall.
Eddy Hopping
Article describing the Eddy Hopping technique for moving a group down a section of white water.
Leap Frog
Article describing the Leap Frog technique for moving a group down a section of white water.
Eskimo Rescue
Article describing the various techniques for righting a capsized kayak using the eskimo rescue technique. This is often used before the paddler has perfected rolling the kayak.
Cartwheels
The cartwheel seems to be one of the first 'modern' play boat moves that most aspire to perfect. A cartwheel looks pretty impressive but in essence there's not a great deal to it - it's a series of sweep strokes with some careful edging and body rotation - it just takes a bit of practice to bring all the elements together and hey presto, you're there!