Yup, and they've consistently marketed it on the website as a server option for small business. (That is, places that don't want to buy or support a full Apple Xserve.) From the site, "Mac mini means business. Small business."

I wonder what their numbers are for it. I see zero advertising for this option, but maybe I'm not looking in the right places. And the mention on the Apple site is clear, but not exactly huge. I imagine it's a niche market, but I wonder.