Fly Alaska has a fairly comprehensive listing of flight operations in Alaska. For a one-time $20 fee they also have a membership site with information on who hires, what kinds of aircraft they fly, links to their websites and other info.
I haven't found any other source of Alaska flying jobs information that comes close to this one for lots of info. There is also an interesting essay with diagrams on commercial fish spotting in Alaska, although it sounds pretty hairy to me.