I will be making my first stacked fondant cake. My son's wedding cake actually. I know when making a stacked BC cake to use powdered sugar or something to keep the tiers from sticking but what about fondant? What kind of sticking issues will I have when seperating the tiers?
Joanne 
I'm actually making my firsy fondant tiered cake as well for my daughters's wedding next month. I had planned to leave each cake to be stacked on a plastic circle resting on dowels implanted into the cake that it would be resting on with a dab of buttercream to keep it in place. now that you raise the question I'll be watching to see what the more experianced decorators have to say about it. 
I've been wondering this same question. I'm doing my first stacked fondant cake in a week. can I put the second tier (there are only two) on a piece of cardboard and then put the cardboard on top of the ps on the first tier? I also need to transport this. It should transport fine if its only two layers right?
Another question about fondant cakes...Three tiers, stacked...each will be on a cardboard or foamcore sized to fit. Do I take the fondant under each board or stop at the bottom of the boards? I am thinking that I go under each board. There will only be ribbon at the bottom of each tier for a border.
Joanne
I trim my fondant flush with the bottom of the board, no fondant under the board. Then I use my palette knife to sort of tuck the bottom of the fondant (only the front part) so it has a more finished look. If there is a ribbon at the bottom of each tier, you don't even need to tuck it.
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