This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Some indications that you might want to use SAX: 1. XML documents too large to fit in available memory 2. Only a small amount of information needs to be pulled from the document 3. The document processing can be done in a "straight thru" pass - for example extracting data from many identical records to a CSV text file.