All SAP T-Codes : http://www.saptcodes.com/

SAP Help: http://help.sap.com/

SAP SDN: http://www.sdn.sap.com/

SAP Fans: http://www.sapfans.com/

Blog for most of the SAP modules:  http://sapcrm-info.blogspot.com/ (thru header you can navigate to different modules).

 http://www.sapmaterial.com/ 

 http://www.sap-img.com/

http://www.sapbrainsonline.com/

http://www.sapdevelopment.co.uk/   http://www.sapdev.co.uk/

http://e-mory.blogspot.com/

http://sapro.blogspot.com/

http://www.geocities.com/rmtiwari/  http://www.rmtiwari.com

http://www.sapfunctional.com

http://www.saptechnical.com/

 http://sapdocs.info/ (this site has all the documetns and linked to all the useful sap sites).

http://sap2you.blogspot.com/

http://www.sap-exp.com/

http://www.allsapsolution.com