Hey. it's a Microsoft link day here at the ol' blog, so... Another useful one:

http://www.microsoft.com/technet/community/itlinks.mspx

Microsoft's IT Pro communities are a good resource for a variety of MSFT servers and technologies. Newsgroups and a huge amount and variety of information - coming from both inside and outside Microsoft:

Would you like to get your computer advice directly from the world’s leading technology experts? Interested in tips from power users or developers? Do you have tips you’d like to share with others? Then you’ve come to the right place. There is a lively community of computer experts and computer users who are taking advantage of the Internet to exchange ideas, information, knowledge, and expertise about Microsoft products and services. The Microsoft Communities Web site provides access to wealth of newsgroups, chats, user groups, tips, and discussions where experts and users who are passionate about Microsoft technologies share their thoughts, help, support, and ideas.