PDK 3.0 for .NET is available for download on SDN.SAP.com
SAP published a new version of the PDK (Portal Development Kit) for .NET a few days ago on SDN. The new version of the PDK supports now Microsoft Visual Studio 2008 as well as the .NET Framework 3.5. You can download the PDK at http://service.sap.com → Downloads → Installations and Upgrades – entry by Application Group → SAP NetWeaver → PDK 3.0 for MS .NET. SAP also plans to make an evaluation version available soon on SDN.