Jazzy Glen Rose
Glen Rose's videos have a big following on Humble Baritonics. Glen's videos get a lot of interest and his Jazzy Ukulele books teach jazz in a simplified and easily attainable manner. I have had the opportunity to meet Glen a few times in Santa Cruz, California and he ocassionally provides updates when he's travelling in Viet Nam or Thailand as part of his musical travels.
Terry Dowman has a compilation of 25 of Glen's Videos on YouTube. Note that many of the YouTube videos are provided in GCEA tuning. These videos give the shapes of the simplified chord patterns that are used similarly on the baritone ukulele. Glen has prepared books specifically for the baritone ukulele.