I have a site which has produced about 3,000 pieces of content in two years. Some original, some press releases, some including a little content with a link to a page elsewhere in the mainstream media. We had some pretty nice page one rankings for some longer tail keywords, but since summer, we've dropped off the Google SERP map.

They're indexing pages, it seems, but we've lost about 3/4 of our Google traffic because of the whims of the mighty Goog. It's frustrating beyond belief. Can anyone help a relative neophyte in this area?