Here are some of the links from my favorites menu.

Driver Development

www.danlan.com - Lots of Network driver development stuff

Nate Bushman's Web Site - Very good site for beginners in driver development

Kernel Mode Systems - NT and WDM driver stuff

Windows Driver Developers Digest - Windows driver development site maintained by the gurus of driver development. Very young site but the one of the best.

Windows DDK  - Microsoft site from where you can download latest DDK's

PCAUSA Web Site - A very good resource for Windows network and NDIS driver development stuff

NDIS Web Site - Excellent resource for NDIS driver development

OSR Web Site - Great resource for driver development, home of NT Insider magzine and NTDEV list

SysInternals - Site maintained by Mark Russinovich (Inside Windows fame !)

NTFS - Execellent info about NTFS and FS driver development

General Programming

MSDN - The Online MSDN library

CodeGuru - Free source code, discussion forums etc.

CodeProject - Same as code guru

NT Club - Site dedicated to NT OS

Undocumented Windows NT - Some undocumented functions/features of Windows NT

Win 32 Samples - Some good Win32 programming stuff

Intro to Reverse Engineering - Good stuff about processes, executable image files etc.

NT Internals - Lots of undocumented NT functions

Sockets - Windows socket (WinSock) development information

DevX - Widows development/training and other resources

Bjarne Stroustrup's Web site - Personal web site of the C++ inventor. Contains lots of stuff on C++

Data structures and Algorithms

Dictionary of Algorithms and Data Structures - A host of algorithms and their implementations

Standards

W3G - WWW Standards

W3G School - Good tutorials about different Web technologies