What can I do to learn to play the Ukulele?

I started out as just some guy who liked to write music and could sing pretty well. Now I sing three nights a week at a local coffee shop and I have booked a few solo gigs on the town. My buddies sister plays guitar for me right now but she is admittedly a horrible teacher. I haven’t played an instrument since the sax in high school and I really want to learn to play the Ukulele. Anyone have any suggestions? Computer programs, books or anything. I don’t know if there is a significant difference between a guitar and a ukulele. I tried some of the local music schools but none specifically focus on Uku's. I love the sound and the type of atmosphere they create and they could compliment the songs I sing. Any help would be most appreciated!