In UKE Magazine Issue 21, there are a series of lessons in Technique zone, with accompanying videos.
Lesson One - Ukulele String Bending
This is a video tutorial explaining how you bend ukulele strings, to add colour to solos and instrumentals.
Lesson Two - Ukulele Harmonics
This is a video tutorial explaining how to play harmonics on your ukulele.
Lesson Three - Exploring the Neck
This is a video tutorial explaining a method to explore the upper reaches of the ukulele neck, without barre chords.