For those getting started with WebSphere App Server, I thought I'd refer you to some various sites for general information. All of these sites are also bookmarked at http://del.icio.us/klenny/was7
WAS 7 Infocenter
What's New with WAS 7 (Tom Alcott is a great writer and a guru on WAS)
WAS fixpack 184.108.40.206 (a must have install)
An overview of administrative enhancements (part 1)http://www.ibm.com/developerworks/websphere/techjournal/0811_apte/0811_apte.html?ca=drs-
Education Videos of WAS 7 (these are extremely helpful... not just marketing hype).