Internet Self Help Packages/Services

I would like to implement an Internet Self Help Package/Service to my company.

I looked into a service known as Ask-It! (http://www.askit.com). This seems like a decent service, though the knowledge base must be grown by my own helpdesk.

Doesanyone know of something comparable, that might include some “canned” responses that we could add onto and possibly tailor for in-house use.