Here's a
video we shot recently on "How to Field Graft a Fruit Tree":
An invaluable technique for propogating fruit and nut
trees on the cheap, if you have wild volunteers, or plant seedlings/dig up
root suckers for rootstock.
Hope it can be helpful to some of you! And for those of you who already do field grafting, I would be interested to hear how your approach compares, and what kinds of trees you've had success field grafting. We've done it mostly with pears and persimmons, and occasionally peaches (mainly to a peach-almond cross called "Hall's Hardy" that is better suited to the Southeastern United States than CA almond varieties), apples, plums, and mulberries.