HTML

Home – http://msdn.microsoft.com/en-us/library/aa737439.aspx

API – http://msdn.microsoft.com/en-us/library/ms533029(v=VS.85).aspx

How-to’s – http://msdn.microsoft.com/en-us/library/ms537623(v=vs.85).aspx

CSS

Home – http://msdn.microsoft.com/en-us/library/ms531205(v=vs.85).aspx

API – http://msdn.microsoft.com/en-us/library/ms531209(v=VS.85).aspx

How-to’s – http://msdn.microsoft.com/en-us/library/ms531212(v=VS.85).aspx

JavaScript (AKA Jscript)

Home – http://msdn.microsoft.com/en-us/library/hbxc2t98(v=VS.85).aspx

API – http://msdn.microsoft.com/en-us/library/yek4tbz0(v=VS.85).aspx

How-To’s – http://msdn.microsoft.com/en-us/library/4yyeyb0a(v=VS.85).aspx

JavaScript (as of IE9)

Home – http://msdn.microsoft.com/en-us/library/d1et7k7c(v=VS.94).aspx

API – http://msdn.microsoft.com/en-us/library/yek4tbz0(v=VS.94).aspx

How-to’s – http://msdn.microsoft.com/en-us/library/4yyeyb0a(v=VS.94).aspx

Internet Explorer

Home – http://msdn.microsoft.com/en-us/library/aa905850.aspx

IE9 Beta Guide – http://msdn.microsoft.com/en-us/ie/ff468705.aspx

- Thanks to Rey Bengo (http://blog.reybango.com/)