A free video course for beginners, although uke players with some experience might find some useful information as well. Many songs are taught in the five most common keys used on the ukulele. Strumming is kept simple but later on you can revisit the same songs and apply other picking techniques such as clawhammer or fingerpicking to these same songs for additional practice and a better understanding of improvising on the ukulele.
Ukulele strumming examples from ezFolk.com. All of these are in 4/4 time, from very basic to fairly complex. Once you learn the strums you can try them out in different songs to see which works best, but they're mostly interchangeable. All of the strums plus some notes on playing them can be found on the following page at ezFolk... http://www.ezfolk.com/uke/Tutorials/Strumming/strumming.html