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Hope the following links will assist you a lot

http://www.sapedition.com/index.html
https://www.sdn.sap.com/irj/sdn/forums
http://www.onestopsap.com/
http://www.sapbrain.com/TUTORIALS/FUNCTIONAL/SD_tutorial.html
http://www.sapfans.com/
http://www.saphelp.com/
http://mysapbi.blogspot.com/search/label/SD
http://www.sap-img.com/sap-sd.htm
http://www.sapexperts.com/
http://www.sapscene.com/
http://www.WorkCircle.com/London/
http://www.sapbrain.com/
http://SAP.ITtoolbox.com/
http://www.cforia.com/