525507 Client login area

We would like a WEB 2.0 style client login area for our new site. The site runs on wordpress but it does not have to be integrated to that. 1. We would like the ability to upload a project description. 2. Upload images/.mov files as we progress through a project and we would like out client to be able to leave feedback for each upload. once feedback has given we would not like it to be editable. 3. Project managers we would like to be able to upload comments. 4. At the end of the project we would like the client to agree to a project sign off page (tick boxes) which leads them to a download page to get the final images/project. This can be hosted on our server. We need to be able to upload multiple projects and assign a usernames and passwords.