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It's a highly interesting and extremely involved subject but one that makes total sense and a method that clearly works - the moon goes through two principal monthly cycles one in relation to the sun and the other to the stars. The moon's gravitational pull controls many things on earth including the tides, rainfall and even the movement of liquids in plants.Lunar planting is timing your garden tasks according to where the moon is in relation to the sun and stars at particular times during the montly cycle - for instance, around the time of the full moon in particular, the moisture content in the soil is at its highest - so the best time to sow seeds for better germination, this is also when we see the highest tides. Another suggestion is to prune your plants as the moon moves through its waning phase (from full moon to new moon) as this is when there is least sap rising. The list is endless - do add any comments or tips you may have on this if you read this article...
An additional good source of reference is Nick Kollerstrom's book "Gardening and Planting by the Moon 2008 - this also includes a lunar calender for 2008 which gives all sorts of helpful hints and tips of what to do on each day of the year!