We at CIGNEX developed online PDF Viewer Portlet using ICEFaces and ICEPdf frameworks. It is based on ICEPDF reference implementation.  This PDF Viewer portlet provides following features.

• It is integrated with liferay's document library. So if we add this portlet on any community/organization page. It allows us to browse pdf documents available in document library.

Recently CIGNEX has successfully rolled out an enterprise level CMS solution for a major insurance company in USA.  CIGNEX integrated Drupal front-end and Alfresco back-end to create a high-performance, low-cost, flexible and scalable solution.
 
Why to use Drupal and Alfresco together is the best-of-both-worlds: You get the speed of development and flexible user interface that Drupal brings plus the strength of a scalable enterprise repository that Alfresco provides. 

 
Alfresco is a highly scalable content management system where you can store millions of documents and perform many workflow tasks.  Alfresco provides a basic dashboard to list and track the tasks.  You can also configure Alfresco to provide full audit trail information.
However, Alfresco does not provide a strong "Reporting" framework out of the box.  We integrated Crystal report with Alfresco CMS for one of our customers and here is the information -