Jakob Schmidt, a long-time jodan practitioner and Kendo World forumite, has written a very useful article on practicing jodan at Kenshi247.net. There are also a lot of great jodan videos to be found on the net like this one from Kendo World's channel, which you can watch in HD! And the one below has a fantastic translation by Kenji, who came to Kangeiko last week. I learned a lot just watching it... when I was able to stop laughing (you'll understand when you watch it)! And of course Chiba sensei himself will be here in August (although I've never seen him instruct in jodan).