called an "angel food cake breaker"
google results:
http://www.google.com/search?hl=en&client=firefox-a&rlz=1R1GGGL_en___US343&hs=UHn&num=30&newwindow=1&q=cake+breaker+angel+food&aq=f&oq=&aqi=
many sources from vintage to new.
I found this one, I think i'm going to order it 
http://alwaysbrilliant.com/aa/aspx-products/pid-6508/pd-57323/bb/p.htm?SessionID=sqm7vog2AeWI0uj0EQjlSCs4gEBETkFg%2bt86vLP1S4Q%3d
I was in a panic for my 9-12 wedding, which was a freebie for a friend. I couldn't find my comb! aauuuggghhhh! I had to cut the cake without a comb! Came straight home nad ordered one from ebay for ten bucks. Found the comb 2 hours after ordering the ebay one. Oh well ...now I have a back up!
I served up a cake using your cutting guide tonight. I love how easy it is to cut the strips, then cut them. Only problem, I started right to left, instead of left to right! I had my arms crossing over and my hands were a mess. Partway thru, I realized that if I cut Left to Right, everything worked great to just nudge the piece onto the server, then onto the plate, no fingers needed!!!
I am going to order one of those combs. Thanks Debi!
I use these all the time to cut cake, I even send three of them with every wedding cake for them to use to cut the cake. Less mess, saves on servings and helps plop that cake slice right on the plate. I don't ever cut a cake with out mine. Big events that order several sheet cakes, I even send along. Everyone is amazed after they have used them. My local cake shop carries them in stock for about the $5-6 price range.
Okay, what is this? How does it work? Someone please clue me in 
The tool was orignally invented for cutting cakes that would otherwise be squished by cutting with a knife, for example, a sponge cake.
To see how it is used as a serving tool, scooch up the page to Indydebi's post, and click on the first link under her signature. Once taken to her website, on the left, click on How to Cut the Cake.
It makes serving any cake so much easier and neater, not just wedding cakes.
I also use her cutting guide and I LOVE LOVE it!
Thanks Deb for sharing that information, I just love how much easlier it is and it does make a very nice slice of cake 
God Bless,
Sharon
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