Welcome to WebmasterWorld Guest from 220.127.116.11
I have made many small changes over tha past few months thanks to info picked up on WW and would like to thank everyone that has contributed (especially g1msd for the many articles posted on dupe content)
I'm not pretending I now have all the answers but I have learnt that content and structure really is king (you just need to understand what content G considers to be quality)
In short all I have done to deal with the supplementals is ensured that each url has it's own title and meta description. Where I had a page containing the same (or a subset of) content words as another page I have added nofollow to the second page navigation and banned it using the robots.txt I have also cut down on the internal linking as I had pages with 200 links to internal pages, many of which just led to other pages with 200 links to other pages...etc. I spent an evening mastering(?!) the mod_rewrite and regular expressions and used this to make sure that the url's all resolve to where they should.
Before last month I was on the front page for one of the phrases but was knocked right out of SERPS altogether until today.
I'm going to close the thread now to keep the conversation from wandering. What more is there to say, after all - it's a nice win!