I so feel like a newbie posting this question, it must be the cold messing with my mind... How would you gather all META keywords from all pages on a website into a neat list, without having to go through each and every page? I use Webceo, but cannot find this option at the moment...
here is a start for you unzip and upload to your server visit the page on your server and input a list Meta Tag Scraper
to get the urls of all the pages on a site find a google scraper to grab all the serps using the site: modifier or find their sitemap >=)
I use "Google Adwords Keyword Tools". You can search that phrase and you should be directed to the right page. The tool will let you enter your domain name (make sure you check search all pages on your site) and populate a list of keywords within your pages. I like the tool because 1 - it's free and 2- it will give you stats for competition and search volume so you can choose the most effective keywords. Good Luck.