I am making a birthday cake for my friend's husband. He likes chocolate cake and frosting that isn't real sweet. The only frosting I've ever made is Buttercream from the Wilton cake classes. And to me it's really sweet. So I need a recipe that isn't real sweet. Any suggestions?

Try indydebi's recipe. I have heard that it's really good and isn't really sweet.
I haven't tried it yet. I like to use warm coffee creamer as the liquid in my frosting and that seems to cut the sweetness.

Eww! That Wilton class bc is nasty! I personally LOVE Italian meringue butter cream, I'm sure there's a recipe in the recipe section, if you can't find one pm me and I'll send you mine. It's a bit more involved and takes a bit of time to make(about a half hour, more or less) but it is SOOO worth it. It uses a boiled sugar base instead of super sweet and gritty powdered sugar and is so smooth and light and satiny. You can add any flavor and colors too, it even works great under fondant. It's only drawback is hot weather b/c of the high butter content it can get soft or melt. Good luck, hope this helps!

I like Buttercream Dream from here on CC. I don't find it too sweet, but if you do, someone said that they add a few sprinkles of popcorn salt to their buttercream to cut the sweetness. Popcorn salt is a very fine-grained salt sold next to the popcorn in the supermarket.

Here are two recipes from Toba Garrett.

Chocolate ganache:

http://www.epicurious.com/recipes/food/printerfriendly/Ganache-109253?printFormat=3x5

Chocolate buttercream:

http://www.epicurious.com/recipes/food/printerfriendly/Chocolate-Buttercream-109248

HTH

I was going to suggest what JGMB said, Buttercream Dream (from this site). I have used it on several occasions, and each time I make it, someone will comment that they like that "it's not too sweet". I have not had to use the popcorn salt, though. But that's a great tip to know!