What is a software architecture?  http://www-128.ibm.com/developerworks/rational/library/feb06/eeles/index.html

They use the IEEE standard. I still prefer my definition: http://blogs.technet.com/michael_platt/archive/2006/03/27/423300.aspx 

Characteristics of a Software Architect  http://www-128.ibm.com/developerworks/rational/library/mar06/eeles/index.html

Again I think the MCA characteristics are better thought out and more measurable:

http://www.microsoft.com/architecture/default.aspx?pid=share.certification&abver=FEEB2E89-4412-4C58-A7F8-9B2CA0E0BDAC