I have a copy of the "Principles behind the Agile Manifest stapled to my cube wall (http://www.agilemanifesto.... One of my favorite principles is : "Agile processes promote sustainable development. The sponsors, developers, and users should be able to maintain a constant pace indefinitely." To me this principle promotes work life balance and leads to less burn out and developer attrition. As our economy weakens I find myself working weekends and into the wee hours. Is this sustainable...