Yeah, it's easier to browse, but it confounds wget for some reason, making it nearly impossible to save for offline viewing. The SGI reference is available in a tarball, even.
You prefer doing that? I just have a bookmark on my toolbar. I never code without an internet connection, so it's easier to look at it online than store it locally.
And, of course, there's the STL, but it's more a reference than a how-to: http://www.sgi.com/tech/stl/