Sharepoint Foundation Workflow - repost

Basically we want a Sharepoint workflow that when someone changes a document it: (1) notifies the correct manager (document controller) who can approve it. (2) once approved it become the real approved document on the site. (3) then notifies everyone who uses the document that it's been changed. (4) has the users acknowledge the changes. We would like to be able to see who has and has not historically acknowledged a document change. We would like the user and document controller to be able to do side by side comparisons of the versions in order to see changes easily. Keep history of unapproved documents. Keep history of approved documents. Mark documents as approved, pending approval, or archived (i.e. for history only). Disallow most users to work with documents pending approval, or provide clear warning that the document is not approved. Saves the history of document changes. Allow users to create a library of the documents that they use. (This could be outside of Sharepoint.) Provide a method for the approver (document controller) to know when a document is pending approval.