It's funny that someone mentioned ganache because I'm trying that now for the first time with another cake.
The good news.. you guys were right, the customer didn't even notice the ripple. I was so tempted to say something about it, but I didn't.
Anyway, I do have all of Sharon Zambito's DVDs and they are excellent. I did EVERYTHING she told me to do EXCEPT the putting the cake in the freezer for 10 minutes before covering it with fondant, so think that must be it. I did use a very thick dam and my filling is just buttercream. I did let the cake settle for 12 hours and I did trim the sides of the cake as well. The were so straight before I put the fondant on! I have a picture of the cake before crumb coating and covering in fondant that I'll try to attach. Thanks for all the help everyone and Happy Caking!