Smart pointers are certainly covered in the glossary: http://www.memorymanagement.org/glossary/s.html#term-smart-p...
the C++ STL takes away the burden of 'hard to implement'. It's definitely hard to do right, but the STL has solved that problem.
I'm sure garbage collection has it's place and use, but the site seems a bit biased against alternatives. Garbage collection definitely has it's scaling challenges for large code-bases.