I see more and more saas products putting out wikis (you can build/integrate your own via wikia.com etc, or github supports them natively for repositories).

For non-technical users, however, maybe a "knowledgebase" would feel more intuitive. Here are some examples:

rackspace.com/knowledge_center/

support.godaddy.com

help.linkedin.com

aws.amazon.com/support/ (need to login to aws first)