There are a few great threads on this and a couple of blogs.
Try this first and I will see if I can find the really good thread.
http://www.artandappetite.com/2009/11/ganache-instead-of-buttercream/
I did that this weekend for my son's birthday cake and I was very happy with the results!
Here is the thread:
BTW: I love ganache under fondant. Actually I just love ganache!!!
http://cakecentral.com/modules.php?name=Forums&file=viewtopic&t=633264&postdays=0&postorder=asc&&start=0
It isn't necessary to "crumbcoat" when using ganache. I use ganache under fondant quite often but I just spread a coat of it on my cake...it needs to be thick enough to give you a smooth finish..if your cake isn't smooth the fondant will not be smooth.
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