Hi-
I need to find a chocolate or fudge cake filling that doesn't require refrigeration. I want to make it in advance and not have to worry about putting the cake in the fridge.
I will be using a chocolate cake and white buttercream icing.
I am open to other filling flavor ideas, as well.
I appreciate any input.
Thank you!!! 
Hi and Welcome on your 1st post, AmyLucy. 
Everything you ever wanted to know about ganache:
(Overview, master and other recipes including whipped and white chocolate. How to glaze, smooth, store and more.)
http://www.cakecentral.com/cake-decorating-ftopict-497433-.html
Chocolate 101:
http://tinyurl.com/ytby98
Faux Bavarian Cream:
(Can be made chocolate, and if using Rich's Bettercreme will be shelf stable for 5 days.)
http://www.cakecentral.com/cake_recipe-2396-Bavarian-Cream-Filling.html
Rich's Bettercreme Handling Instructions:
(For ready to use, but applies to liquid when whipped.)
http://tinyurl.com/yt4eyu
HTH
Oh you are so lucky to have your first post answered by JanH 
. Such perfect info Jan, I would only add this one, the "blender fudge" (or "blender ganache") recipe posted by txkat. I don't know the original thread but someone else posted it at the bottom of this similar topic http://www.cakecentral.com/cake-decorating-ftopicp-6176469-.html#6176469
I looove ganache, but it depends on the texture you are going for. If you want truffly, do a straight ganache; if you want fudgy, the link I just provided fits the bill. For something lighter, Jan's links about Rich's are the way to go
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