I have used ribbon on BC several times and haven't any any problems with it. I prefer using the ribbon thaat has wire in it as I think it is easier to work with. Roll out enough ribbon to go on the cake (don't cut it off the roll though) and make sure you have a pair of sharp scissors handy to cut at the end. I start by piping a little icing on the back of the cake, attach my ribbon, slowly go around the cake and push in lightly (helps if the cake is on a lazy susan) and then pipe alittle icing on at the end and press ribbon into that. Hope this helps you!
~Luraleigh~
I have used ribbon on BC several times and haven't any any problems with it. I prefer using the ribbon thaat has wire in it as I think it is easier to work with. Roll out enough ribbon to go on the cake (don't cut it off the roll though) and make sure you have a pair of sharp scissors handy to cut at the end. I start by piping a little icing on the back of the cake, attach my ribbon, slowly go around the cake and push in lightly (helps if the cake is on a lazy susan) and then pipe alittle icing on at the end and press ribbon into that. Hope this helps you!
~Luraleigh~
I just recently did this for the first time (my anniversary cake in my profile) and it turned out great! I had researched this alot and read that with a satin type ribbon the grease may show through after it sits. Someone recommended that you put some of your frosting on the ribbon overnight and see how it holds up the next day. But this is really easy and SO pretty!
I did it on the wedding cake I made (in my photos) and I just did it enought in advance that it soaked up the greasy uniformly! lol! They really, really wanted that particular ribbon and I told them there may be a problem but they said they were not too worried about it.
All that happened was that it was a shade or two darker than the original color. Being that it was satin--the greasy spread out on it and didn't get all splotchy.
HTH!!
I was thinking about the satin ribbon issue (the grease soaking into the ribbon). What do you think about this - what if you put scotch tape on the backside of the ribbon before putting it on the cake. Do you think that would work? It's pretty flimsy so I don't think it would cause a problem with making the ribbon too stiff. What do you think? 
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I don't know about scotch tape?! I remember reading a thread here on the board about ironing on wax paper. Do a search and hopefully you can find it!
I tried the tape and it didn't work because the grease deactivated the sticky part of the tape.
I also know that people just put parchment right on the cake and then the ribbon on top of that.
I guess you will just have to play with it and see what happens. Since it was an even "soak" for the cake I did, nobody even noticed that it had happened and the ribbon was still shiney, etc.
Lisa
Usually you do this on a fondant cake. you make a small slit to the size of your ribbon. Cut the ribbon into equal lenghts...
the slits are a little shorter than the ribbon lenghts that you cut. You push one end into the slit and you can "bubble" it out and pop the other end into the other slit.
You must make sure that all your slits are the same height from the cake board.
Measure it with a ruler.
Cut a length of parchment or wax paper that is the length & width of your ribbon.
Wrap it around the cake first. You don't need any icing to "glue" it on...it will just stick. (Best if cake is chilled...so you don't pull of the icing if you have to adjust it slightly!) Because it is practically clear, you won't see it on the cake!
Position your ribbon overtop and secure at the back of the cake with a dot of royal icing or a beautiful pearl-headed pin.
Voila! No grease stains!!
I always dye some fondant to match the ribbon.
I cut the fondant..wrap around the cake and place my ribbon over the fondant.
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