Ukulele Tuning for iPhone or iTouch - UkeTuTu is a free audio-visual tool to quickly tune your Ukulele, powered by Ruben De Anda's popular Ukulele Tuning video
Video for Standard ukulele tuning / High G / C6 - Sound of loose strings - gcea
Ukulele Chords Book + Online Video - Mel Bay Publications, Inc. : Mel Bay