One of my favorite resources when I get stuck on a statistical detail is SUGI Proceedings papers. These are pdf papers written by and for SAS users, often with solutions to very specific analysis issues.
They cover all levels of mathematical detail and all sorts of topics. While they are, of course, about SAS, they often cover the statistical issues, so are useful even to non-SAS users.
For example, one that I used recently is: Analysis of Count Data using the SAS System.
You can get all the papers at the renamed SAS Global Forum. You can browse titles or search for a specific topic.