Great collection of Research Papers
Not only Siggraph, but also Eurographics and a lot of more specialized conferences.
I already found a number of interesting rendering-related papers. Nice !
Pixar’s On-Line Library
Just in case you didn’t know, Pixar has been maintaining a public archive of siggraph / technical papers they published over the years.
It goes from the latest ones all the way to some seminal publications, like the cook-torrance shading model, or antialiased shadow maps. An occasion to remember that they invented pretty much all the stuff we use everyday…
Great C++ reference site
Sometimes a bit sluggish, but very easy to use.
http://www.cppreference.com/