[i] I've been seeing this Mirror Icing on several cakes and I'm wondering what this is. Can anyone tell me about it? Do you have to buy it or is a recipie for it? Thanks for any info!

Can you post a pic so we know what you're talking about. this sounds interesting. Thanks.

http://www.belleepoque.co.uk/img/cakes/3.jpg
It is called Chocolate Miroir or Glaçage au Chocolat

Chocolate Mirror Icing. I know you can but, but I wonder if there are any good recipies to make at home? Looks sooo pretty!

Why isn't that ganache with a bit of corn syrup added?

Ganache with corn syrup doesn't maintain the shine that you get with a well made mirror glaze. 

There is a recipe for it in Rose's Heavenly Cakes. . . there are also recipes on the 'net if you Google Chocolate Mirror Glaze.

I've made it once  http://grandmasugarskitchen.blogspot.ca/2012/03/two-cakes-today.html

The cake (ganache/mousse) under the glaze must be perfectly smooth.  The slightest flaw will show (as you can see along the edge of my own example), though once it dries, I suppose you could give it a second coat to disguise the flaws.