Dougy - 2:25 pm on Dec 27, 2006 (gmt 0)

Hi

I recently discovered that a large proportion of my site (600 out of 850 or so pages) are supplemental. My rankings have been slowly dropping.
After reading around i have learnt that it is probably due to some of the duplicate content i have on some of my pages.
What i cant seem to find is the best solution to remove these duplicate content pages from supplemental results.

Do I
A) Rewrite the content on these pages and wait for them to be re-crawled
B) Delete these pages and any internal links to them
C) Use robots.txt to block the spiders accessing these pages
D) Use the blank page method as discussed [webmasterworld.com...]
E) Forget that site and concentrate on another site

Any advice would be much appreciate