Windows Server
SearchWindowsServer.com - Windows Server information, news and tips
Ask the Core Team - Microsoft Enterprise Platforms Support: Windows Server Core Team
Networking
Eric Cross's Networking - This website guides you through troubleshoot networking with Windows clients. It contains a collection of KB network related articles and provides some of the most common problems with answers that should help you with your network.
ITworld.com's Networking Strategy Center - Industry experts provide strategies, tips and best practices for designing, implementing and securing complex, enterprise-level networks.
Techworld.com - The computing and networking knowledge centre
4sysops - News, views, and reviews for system administrators.
MajorGeeks.com - More tested and useful downloads than you can shake a geeky stick at.
Petri.com - One of the most comprehensive MCSE and IT related web sites. With hundreds of tips, tricks and how-to articles, MCSEworld has become one of the world's leading MCSE and IT related knowledge bases.
TechTutorials.net - TechTutorials provides free computer reference information including a searchable directory of free tutorials, white papers, tips & tricks, FAQs, HOWTOs and other sources of free technical information that cover a wide range of computing and technology topics.
SearchNetworking.com - Networking news, tips and advice for enterprise IT professionals
Tech Blogs
StefanRoth.net - Things about System Center and Cloud…
Michael Niehaus' Windows and Office deployment ramblings
Aidan Finn, IT Pro - A Hyper-V blog, but you'll also find Windows Server, desktop, systems management, deployment, and so on …
Keith's Consulting Blog – A security related blog that aims to help everyone secure their systems
MS4U - Run by Hyper-V MVP Lai Yoong Seng
Tech Ticker - Extensively covers gadgets, consumer electronics or anything related to the technology sector.