There seem to be three "big" systems of kobudo right now. Matayoshi Kobudo, Ryu Kyu, and Yamanni Chinen Ryu.
I enjoy practicing Yamanni Chinen Ryu kobudo, which is an old Okinawan style of kobudo. I'm no expert, but I do hope to one day test with Oshiro Sensei for a Yudansha ranking. I still have a lot of work to do, though.
If anything, there are several folks who are far more proficient than I am, in this system, who may be able to give you a better insight.
This system utilizes long, flowing, legato strikes, maximizing the striking power of the bo, yet also maximizing the defensive capabilities by shortening the grip while blocking. Things flow together smoothly, and it becomes second nature to transition seamlessly from an offensive attack to a defensive move, and vice versa.
The kata are smooth flowing forms, and they look really impressive when someone with a good set of fundamentals performs them. Yamanni Ryu has been making a good impact (no pun intended) on the USA-NKF competition, and I hope that it continues to grow and develop.
I can tell you right away, that he sells a really good video disc called "Yamanni Ryu, Vol. 1" that covers the fundamental techniques, as well as four of the fundamental kata in the system (Suuji No Kun, Chou No Kun Sho, Chou No Kun Dai, Ryu Bi No Kun), as well as several drills.
I will also tell you, though, that the video is best used as a supplement, and not as the main source of training. It's best to learn from a live instructor, of course.