Overriding the number of posts options in archive.php

In my options under reading, the number of posts to show is 8 only. For all my archive pages, I just want to list the titles of the posts and wrapped with <ul> and <li>. In that case, I need to present more than 8 articles in these archive pages (monthly, yearly, tags, categories, author, etc.). I’ve tried this hack http://weblogtoolscollection.com/archives/2008/04/19/paging-and-custom-wordpress-loops/ but no success. Can anybody help?