Here I have listed some ABAP tutorials available online on varied topics. Some are step-to-step guides for performing a task in ABAP ... some are articles ... presentations, etc.
First of the 5 part series to look at basic ABAP Object Oriented concepts.
Article : Table Maintenance Generator
A detailed guide for generating Table Maintenance view of a custom table and types of modifications available in Table Maintenance Generator.
ABAP tutorial on Conversions/Data Migration
Introduction to Legacy System Migration Workbench (LSMW) - a tool to upload data to SAP.
SAP - BDC & File Handling : Presentation on WiZiQ
Introduction to Batch Data Communication (BDC) and different methods used in BDC to upload data from file.
SAP Netweaver http://help.sap.com/saphelp_nw2004s/helpdata/EN/30/c4461ff69d5a438f1286e344b545fa/frameset.htm
Introduction to WAS : Presentation http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/e1515a37-0301-0010-b2bb-99780cb4cafa?QuickLink=index&overridelayout=true
Components of SAP Communication Technology http://help.sap.com/erp2005_ehp_04/helpdata/EN/10/361b3f7f9e3642e10000000a114084/frameset.htm
OPEN DATASET
MSG Thread https://forums.sdn.sap.com/message.jspa?messageID=71051
Purpose of having Tcode START_REPORT
MSG Thread https://forums.sdn.sap.com/thread.jspa?threadID=379046
Database Utility in SAP
http://help.sap.com/erp2005_ehp_04/helpdata/EN/a4/3790360ee65840e10000009b38f839/frameset.htm
Date Format Conversion
http://anu-sapdiary.blogspot.com/2008/03/function-modules-for-date-conversion.html
CL_SALV_TABLE
http://forums.sdn.sap.com/thread.jspa?threadID=1718317&tstart=-1dfv
The COmmon Reference Architecture (CORA), Part I
http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/19381
UCCHECK Flag for Business Object SW01
A SDN ABAP discussion thread on setting this flag for business object.
Simplifying the capturing, evaluation and communication of Class-based exceptions
Next Generation ABAP Runtime Analysis (SAT)
One of the most significant improvement in Release 7.0 EHP2 - ABAP Runtime Analysis tool. Transaction code for the tool is 'SAT'.
SAP's NetWeaver is an Enterprise Integration Platform
What has SAP, an Enterprise Application company, ventured into the technology platform space with SAP Netweaver ?
Collaboration workspace from SAP
This a place of collbaoration for SAP customers, partners, consultants and SAP. You can use the SDN Login ID to logon to SAP Netweaver 7.0 ABAP which is the ABAP Technology page on docupedia. Here you will find documentation relevant for AS ABAP on SAP NetWeaver 7.0 EHP1.