The other day I was trying to grapple with some WebSphere Application Server internals. I normally start with Info Center, search IBM Intranet, IBM support and then Google (in that order). I was surprised to find Billy Newport's blog http://www.devwebsphere.com/devwebsphere/ on the public web.
Billy is the WAS HA lead and a very smart/practical architect. His blog sheds light on WAS internals that some time gets left out of the Info Center. A very good read and additional resource if you want to understand HA concepts.
There are couple of blogs worth mentioning as well, that provide a different insight into the IBM Software Group thinking luminaries- Don Ferguson's blog http://www-128.ibm.com/developerworks/blogs/dw_blog.jspa?blog=393&ca=drs-bl
and Grady Booch's blog http://www-106.ibm.com/developerworks/blogs/dw_blog.jspa?blog=317
Until next time....