cd903952_se__mySAP__mySAP_com__ERP__R3___Description
[User Group] www.sap-img.com [Type] SAP Information [Description] 
This is a website, contains a lot information around SAP as well. The information is really good structured, so that you can find things fast. It covers a lot of modules and tries to help you with your questions. As soon as the level of expertise is reached where this site can help, it suggests an interesting book in that area for further reading - as this is done so often and always linked to Amazon.com, this seems to be one part of refinancing this website.
SAP User Groups (R/3, R/3 Enterprise, mySAP, mySAP.com, ERP, R3)
Description