Are you frosting and filling the cake with something perishable prior to glazing? (If not, refrigeration is not required.)
Handy safe storage chart for frostings and fillings:
http://tinyurl.com/ymqp6x
(From Sarah Phillips of baking911.com.)
Everything you ever wanted to know about chocolate ganache:
(Includes overview, master and other recipes, including white chocolate. How to glaze, smooth, stack and more.)
http://forum.cakecentral.com/cake-decorating-ftopict-497433-.html
Chocolate 101:
http://tinyurl.com/ytby97
HTH
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