We are currently working on a new SAP book which focuses on the upgrade to ECC 5.0 from a project planning, technical and development point of view. It is scheduled to be published by SAP PRESS in the second quarter of 2006.
Another option is the advanced SAP training ADM326, SAP Enterprise Upgrade. And last, but certainly not least, all the SAP upgrade guides are available in SAPNET at http://service.sap.com/instguides. White papers, do and donts, presentations can be found at http://service.sap.com/upgrade.
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