"Numerical Recipies" is a good book, but you do have to keep in mind that it was mostly written several years ago, and this is a field where a lot of people are actively researching a lot of topics, and not just the obscure/niche ones.
I recently did a fair bit of work with matrix computations, for example, and while "Numerical Recipies" and "Matrix Computations" were both useful for background material, the technical notes that go with LAPACK were often far more up-to-date (and a source of the latest research papers behind the LAPACK implementations as well).
