O'Reilly's XML Hacks Ran across this in one of O'Reilly's promo emails and I think it's a good starting point for exploring the capabilities of lightweight XML and web services functionality. Probably have to put it on my "buy" list soon.
InfoWorld Special Report: Solving the identity crisis -- Companies are finally beginning to recognize the fundamental nature of identity in almost any business transaction of value. This Infoworld Special Report considers identity from several angles, each one timely and relevant to today's enterprise IT environment. Identity is the convergence point for e-security and service-oriented architecture, and businesses that recognize and exploit the opportunities underpinned by a successful and robust identity infrastructure will spend less time battling electronic invasions and manually chasing transactions across discontiguous application identity spaces, enjoying substantial improvements in efficiency through easier system integration, both inside the enterprise and within trading communities willing to establish an effective identity federation.