I'm an admitted and proud fishing junkie, but had long ago resigned myself to the fact that my favorite ingame pasttime was never going to be a source of revenue. But Alterac Volley has a great post on the degree to which fishing has actually (gasp, shock, horror) become a moneymaking endeavor in Wrath. While I'll grant that on most servers it's probably nothing compared to, say, Mining or Herbalism, there's gold to be made in them there streams -- and this is all the more true if your server hosts a large raiding population.
Read more at WoW.com.