10,000+ writers - Not all are active but its a good start: http://www.constant-content.com You can view the top writers here: http://www.constant-content.com/authors.php
I suggested in another post that if you’re looking for web copy that performs well on search engines, type in some keywords and find out who’s good at their trade! I worked for a firm and frequently had to find web copy talent for various clients…some sucked and some were amazing. Craig’s List was a horror show from my experiences...poor copy, missed deadlines. Gerry Mcgovern and webcopyplus were the best of the best. But now I’m doing my own thing and writing my own copy . No more budgets!