Locally
Ukester LaVonne Post goes to student's homes to teach ukulele, piano & guitar. 
913-424-2426

In addition, Dick Blessing teaches at the Toon Shop in Prairie Village, KS and comes highly recommended. 913-362-6800

Online
Tutorial. Here is a link to Dr. Uke that has some really great downloadable material for those of us still learning. http://www.doctoruke.com/theory.html

Online Ukulele school? You betcha! http://www.ukeschool.com/

This is a downloadable PDF with all kinds of ukulele information for the novice to the advanced. Lot's of cool stuff. Click Here

Tony Danza says:
"My remedy is my ukulele. I sit and strum my blues away. My prescription: Get a uke and a chord book, practice thirty minutes a day for thirty days, and you will be able to entertain yourself, your family, and your friends for the rest of your life."