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I watched a video called Dirtwise last night. It's pretty good and covers a lot of ground, but I could have done without so much interviewing and more analysis of the techniques they introduce.
It does offer some practice drill ideas which I'll be trying before the season really gets under way. Quick stops, stoppies, standing slaloms, brake slides, tight figure eights (standing), and a few jumping techniques, like pre-loading, brake tapping, and gassing it just before touchdown.