Kakes_by_Kim has a recipe in CC's recipes called "Easy Chocolate Buttercream". It looks easy enough and has a good rating. Anybody have any personal experience with it?
http://www.cakecentral.com/cake_recipe-1941-0-My-Easy-Chocolate-Buttercream-Frosting.html
My recipe for choc bc is very similar to the one you posted. I don't use butter though. I use butter flavor and add 1T +1t. The butter/flavor is what makes the cocoa taste rich and creamy. My customers rave over my choc bc! I think it's pretty tasty myself! Either way (butter vs butter flavor) it will be excellent! 
The "My Easy Chocolate Buttercream" recipe that's posted here (if it's the one you're talking about ), is the ONLY chocolate buttercream I use now! I get RAVE reviews about how fudgy delicious it tastes! I add a little more milk to make it easier to spread, but other than that, it's a fantastic recipe and I highly recommend it!
Thanks for the hot tip, Cambo! I do not get too many requests for chocolate buttercream, but I have 2-3 weddings coming up in the next two years, and they all want Groom's Cakes. I guess it's time to add it to my tasting menu!
Theresa 
The "Easy Choc. BC" recipe posted by Kakes_by_kim is similar, if not the same, to the one I use from the Wilton site. It is very delicious and I sometimes add almond extract instead of vanilla. I've done two cakes (in photos) using this recipe and got rave reviews.
And yes, it crusted.
Well, I made it yesterday. I wasn't too thrilled about the taste. I went out and bought three cans of Duncan Hines Calssic chocolate frosting ... which I know I like. It cost $4.50 ... and that's about what it costs to make the double-batch of frosting I made. In my mind, if the cost is the same, and I like the canned better, then why hassel with making it? It will be good to use for the borders of the cake because the canned frosting isn't good for decorating. I will use it up on a cake for my family.
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