This is what is new in support stacks 4 - 12. Stack 12 is the latest. Hope this helps.
<b>SPS 04 (Start of Ramp-Up)</b>
 Initial Content for the Portal (New)
 Upload Content and Actions with XML - New Handlers (New)
 iView Wizard (New and Enhanced)
 Page Wizard (Changed)
 Page Layouts (Enhanced)
 Headerless Navigation (New)
 Service Map iView (New)
 Printing in the Portal (New)
 Portal Catalog Actions (New and Enhanced)
 Portal Permissions (Enhanced)
 Unification, OBN, and DQE (Enhanced)
 System Landscape Overview (New)
 Control Center User Role and End User Core Role (New)
 Support for My Yahoo! Enterprise Edition (Discontinued)
 Activating Write-Protect Mode for the PCD (New)
 Multiple Additions of Same iView (New)
 New Link in Mail iView of CC_User (Changed)
 Support for Connection String System Template (Changed)
 Storage of User Mapping Data for SAP NetWeaver Portal (Enhanced)
 Activating Write-Protect Mode for the PCD (New)
<b>SPS 05</b>
 Portal Catalog Actions (Changed)
 Initial Content in the Portal (New and Changed)
 Web Service Connector (New)
 Performance Improvements to URL iViews (Enhanced)
 Navigation (Enhanced)
 Page Layout (Enhanced)
 PCD Inspector - Support Tool (New)
 Upload of Roles from ABAP-Based Systems (Enhanced)
 Support for Distributed Query Engine (Discontinued)
 Accessible Content Administration (New)
<b>SPS 06</b>
 Personalizing Pages (Enhanced)
 Implementing a Federated Portal Network (New)
 Implementing an External-Facing Portal (New)
 Navigation (Enhanced)
 Page Layout (Enhanced)
 Initial Content for Portal (Changed)
 Page Editor (Enhanced)
 XML Content and Actions (Enhanced)
 Universal Worklist (Enhanced)
 Collaboration Task (Enhanced)
<b>SPS 07</b>
 Permissions and Personalization in Portal Object Transport (New)
 Connectivity Enhancements (New and Enhanced)
 Implementing a Federated Portal Network (Enhanced)
<b>SPS 08</b>
 Implementing a Federated Portal Network (Enhanced)
 User Management Engine (Enhanced)
 Object-Based Navigation (Enhanced and Changed)
 Implementing a Multitenant Portal (Discontinued)
<b>SPS 09</b>
 Portal Content Model API (New)
 Portal Development Kit for .NET (New)
 Implementing an External-Facing Portal (Enhanced)
 Navigation with Short URLs (Enhanced)
 Implementing a Federated Portal Network (Enhanced and Changed)
 Web Service Connector (Changed)
<b>SPS 10</b>
 Implementing a Federated Portal Network (Enhanced)
 Navigation (Enhanced)
<b>SPS 11</b>
 Language-Specific URLs for URL iViews (New)
 Editing the Locale Service (New)
 Implementing a Federated Portal Network (Enhanced)
 Navigation Panel (Enhanced)
 Accessing the System Landscape Overview (Enhanced)
 Related Links iView (Enhanced)
 Desktop Editor (Enhanced)
 XML Content and Actions (Enhanced)
 Dynamic URLs for URL iView (Enhanced)
 Navigation Cache (Changed)
<b>SPS 12</b>
 Drag&Relate Functionality (New)
 Removing Floating Aliases (New)
 Avoid Overwriting Proxy Service Settings (New)
 Language Localization for Anonymous Users (New)
 Report a Problem from the Page Title Bar (New)
 Implementing a Federated Portal Network (Enhanced)
 Object-Based Navigation (Enhanced)
 XML Content and Actions (Enhanced)
 Detailed Navigation (Enhanced)
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