I just mean trying to get API documentation out of MSDN Library. It's completely broken for Win32 and keeps getting worse with every Visual Studio and/or Platform SDK update. Many APIs aren't even in the Index at all now. Pushing F1 over a function name has about a 1 in 10 chance of working and taking you to the page for the Win32 API. I believe the technical term for it is "a load of old gash."
If I want to find out about stuff in general then searching the web is best -- wide range of sources as you say -- but if I just want to read the API contract for something then I want what I had in VC6 where I could highlight an API and push F1 (and not be taken to some page about .Net). Or I could type an API name into the Index tab and it'd actually find it, but not anymore in many cases.
(And MSDN Library used to let me filter out the stuff I didn't use which is no longer possible, but that's the least of my complaints now!)