aggregate.org/MAGIC is highly recommended reading (from my professor's supercomputer group).
There are lots of people and places that create and collect algorithms of all types. Unfortunately, in building systems hardware and software, we in The Aggregate often have found it necessary to do relatively obscure low-level things very efficiently. Many of the tricks we've devised or collected either require assembly language coding or are not entirely portable when coded in HLLs like C, but these techniques are still valuable because they can yield significant performance improvements over the more obvious ways of doing things.
