Raphael here in the office just asked, "I want to know, officially, is it 'Co.' or 'Company'?"
So I just called.
Co.: "Hello, Co."
Me: "Adam Kuban here, from Slice, America's Favorite Pizza Weblog."
Co.: "Um, yes?"
Me: "So there's been some confusion about your name. Are you 'Co.' or 'Company'?"
Co.: We're 'Co.' as in 'company.'"
Does that sort out any confusion, Raphael? It's still sort of a nonanswer answer. But we'll just make the call and say that we'll refer to it on Slice officially as "Co." and pronounce it as co.