Great question — answering as the UphillTech team:
Yes there is one main trick, and some regular skills. The trick If you lower the tire pressure, any tire will float over sand like magic. It should not be so underinflated as to allow easy pinch flats, but the lower the pressure, the more marked the floating effect. There are just two limitations: If the tire is skinny (low volume), it might not be possible to have a pressure level that allows flotation and safe riding over rough terrain on other trail sections; It's not possible to adjust tire pressure "on the fly" ;o) But if you know you're having a long stretch of soft terrain, it's possible to have a good trade-off. Anyway, huge tires (2.3 +) are perfect for that (watch this Surly...
Full answer by heltonbiker: https://bicycles.stackexchange.com/a/10264 (CC BY-SA 3.0).
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