Windows resources

Microsoft

Microsoft's Win32 development site - you can download the Win32 SDK.

MSDN Online - register to see the SDK and DDK documentation.

Microsoft DirectX Multimedia Expo - Microsoft's DirectX site. Follow the Resources, and then Links of Interest for useful sites.

Periodicals

From hardcore Windows to visual development.

Windows Developer's Journal - tends to be Windows SDK based, a good read

Microsoft Systems Journal - sometimes a bit heavy on the bleeding edge.

Windows Tech Journal

Visual Developer Magazine