Over the moon at having a good low G string on a uke at last,(new Aquila Red Series)I've found this great video tutorial on fingerstyle with a low G by Aaron Keim.
Find Aaron Keim, "The Quiet American" here. If you vaven't come across him before, do look - and his videos are superb.
In this one he teaches and then combines two fingerstyle techniques; the roll and the pinch.
Stringing the ukulele with a high G at the 4th string, known as re-entrant tuning, is the traditional way to string a uke. It's bright, it gives that traditional uke sound, and most chords and tabs are for a uke strung this way. The high G is great for bluegrass and clawhammer fingerpicking too. But for classical and jazz pieces, people often choose the low G option.
For a fantastic and popular classical piece, see John Moen's arrangement for Prelude for the First Suite for Unaccompanied Cello, posted 5th May this year, and for more on jazzy chords with a low G, see Glen Rose Jazzy Ukulele. (Post done here 31st May 2012).