Here is to put some online resouces for ETW,Xperf and GPUView, will be updated timely.
Simply said, the ETW is troubleshootiing compolment of Windows instruduced from Vista later.
Xperf and GPUView are powerful diagnostic tools based on ETW for Windows.
Blogs & Articles
ETW Introduction and Overview(http://blogs.msdn.com/ntdebugging/archive/2009/08/27/etw-introduction-and-overview.aspx)
Improve Debugging And Performance Tuning With ETW(http://msdn.microsoft.com/en-us/magazine/cc163437.aspx)