I have done it MANY times and it is fine, just make sure you put the frozen cake in the fridge 1 day before you eat it so that it thaws. You can't leave it at room temp b/c the fondant will sweat and become shiney, this won't happen if you keep it in the fridge till its thawed. Cake and all is still just as tastey!!!!!!
oh oh, I forgot, I used the cream cheese/MM Fluff cream filling here on CC to fill the cake and it froze and thawed very nicely. I was so concerned since it's cream cheese. But it was really yummy!!!!
ginger - did you let the cake come to room temp before serving the day of the party? I ask because cake should be room temp to taste it's best! Thanks!
I don't know about freezing, but I learned the hard way about keeping it in the refridgerator for any length of time. I made my snowflake cake for a Christmas party and had a million things to do so I made it about 4 days early and had it in the fridge. The first two days, looked pretty good. when I went to get it out for the party, the nice crisp looking snowflakes were like a Dali painting. All melted. Luckily I had left the topper off and they were not refridgerated so we got a glimpse of how it had looked. And I had taken photos when I finished it.
I take the frozen cake (with fondant on it) and put it in the fridge for 1 day then take it out and let it sit so it's not too cold before I serve it. I also like cake at room temp, not too cold. And it works fine. As far as leaving it in the fridge for any length of time other than to thaw, no way for me, I think it dries out the cake. JMO. I hope this helps! I have been cake decorating for 14 years and have never had a problem with frozen already decorated cakes with fondant. 
Well, with fondant on it I just froze one about 2 weeks before easter and took it out the day before and it tasted fine, I also had the cream cheese with marshmallow filling in it too and it tasted great, I was worried about freezing cream cheese.
As far as a buttercream iced cake, I had my mom freeze my brothers wedding cake about a month before his wedding b/c I could not get down to do his cake any closer to the date of his wedding. And they got rave reviews on it!!!!
Don't forget that wedding toppers are supposed to be frozen for a year and then eaten, mine lasted 3 weeks after the wedding before we ate it, but I've heard of people actually waiting till the first anniv. and they taste fine.
hope this helps!
ginger
We ate our top tier on our anniversary and it tasted just as good as when it went in but the key is proper storage. You place the cake in the freezer for 3-4 hours to get it frozen then wrap carefully in plastic wrap (carefully so as not to crush any decos) then place in box, wrap the whole box in plastic wrap and then in heavy duty foil. I also changed all the wrap and foil every 2 months until our anniversary.
I'm so glad I found this thread. I have refridgerated fondant sucessfully many times but never frozen it. I can't make it to a friend's b-day party but wanted to do a fondant covered cake for him so now I know with confidence that I can do it early and have his wife take it home with her and it will be ok in and out of the freezer! Thanks ginger!!
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