Enhancement Framework

• Picking material description from custom table in the SAP Sales Order (VA01 and VA02) using enhancement framework (More details)
• Setting the screen elements as mandatory in the transaction DP95 using Enhancement Framework (More details)
• Scenario on Enhancement Framework (More details) 

BADIs

• Fallback class in a BADI (More details)
• Step by Step guide on BADI with Filter implementation (More details)
• Step by Step guide on BADI Multiple use implementation (More details)
• Defining and implementing a BADI (step-by-step with screenshots) (More details)  
• Defining and implementing BADI (With better screenshots) (More details)
• Understanding Business Add-ins (BADI) (More details)  
• Filtering the work items in the SAP inbox using BADI (More details)
• Implementing the BADI for the transactions VL02 & MM02 (More details) 
• Exercise on BADI (More details)  

User Exits/Screen Exits/Menu Exits

• Adding Fields to CJI3 Report (More details) NEW
• Screen Exit for Notification Header (TCode: IW21) and show the custom fields in standard report for notifications (IW28, IW29) (More details) NEW
• Automatically filling the field "Payment Terms" and disable the same while creating PO using the transaction ME22N (More details)
• Modifications to the SAP standard menu (More details)
• Working with Menu Exits (More details)
• Adding custom fields to the transaction CS01,CS02 and CS03 (Bill of Materials) (More details)
• Adding custom fields to the Purchase Order transaction ME22N (More details)
• Implementing Screen Exits for the transaction MIGO (More details)
• Implementing Screen Exit for the transaction CO01 (More details)
• Changing the description of the standard SAP fields (More details)
• Implementing Screen Exit in "CJ01" (More details)
• Adding a custom screen in XD01(More details)
• Implementing Screen Exit for MM01/MM02/MM03 (More details)
• How to implement a screen exit to a SAP Standard transaction (More details)
• Finding user exits using a TCode (More details)
• Working with User Exits (More details) 
• Implementing Field Exit for the transaction MK01 (More details) 
• Adding custom fields using EEWB Transaction (More details)

Business Transaction Events (BTE)

• Scenario on triggering a BTE when a vendor is changed (Transaction FK02) (More details)
• Adding custom fields to the FI report FBL5N using BTEs (More details)
• E-mail EFT Remittance using BTE (More details) 

Others

• Step by step procedure to enhance the BP using BDT (More details)

Also check out the tutorials on:

• SAP Workflow
• LSMW
• XI