IBM developerWorks is IBM’s resource for developers
Oracle Technology Network
Adobe Developer Center
MIT OpenCourseWare, free, high quality self-learning resources.
Mozilla Developer Center
Open Clipart Library
Web Developer’s Handbook
Jakob Nielsen’s Website on usable information technology
smackthemouse.com and
xmlplease.com, Jesper Tverskov on Standards, accessibility, usability, XML
thoughtpolice.co.uk is an excellent collection of VMware images. Thanks Simon!