If you can get your hands on a copy of Zin's "The art of Mountain Bike Maintainece" you will find a set of spoking instructions for a disc front wheel. He specifies leading spokes on the outside of the rim. He goes on to give instructions for a disc rear with trailing/outside on the drive and leading/outside on the non drive side to sort of spread the load.
Most folks recomend against Revolution spokes for this application, opting instead for 2.0/1.8 double butted. The idea is that you can probably create more forces with the disc brake than you can with the pedals.
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