content rewriting, spell checking and link checking for wordpress

I'm getting my site ready for submission to yahoo directory and dmoz directory,as part of that I need to totally clean up the site and rewrite any duplicate content copied from other sites, fix all broken links and fix all spelling mistakes + grammar. The is around 270 articles. while some are ok there is a lot of work to be done. In order to help estimate the size of the work I have attached a copyscape report of the entire site which shows all duplicate content. So job is 1. check for and rewite any duplicate content I have. 2. Check and fix any broken links 3. Check and fix all spelling mistakes and grammar ( should be US english) site is [login to view URL]