EP PDK 5.0 can be found at this URL: https://www.sdn.sap.com/sdn/downloaditem.sdn?res=/html/PDK50_download.htm
You might also want to check out SAP's WebDynpro development framework. WebDynpro is SAP's next generation development platform for building Web-based SAP applications. Their future plans include the full integration of WebDynpro applications within the Enterprise Portal.
A preview version of the NetWeaver technology stack can be downloaded here:
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