I'm currently in the process of updating documentation. You can access it by clicking at the "Documentation" link at the top menu here. I've divided the documentation into several sections, which should assure easier navigation.
The most interesting part (for the end user) is the "Using Slax" section, which lists most of the interesting commands in Slax, presented in arranged tables. I'm sure you'll find at least one useful tool or command you were not aware about in Slax yet :)
Next task is to provide documentation for both using and creating Slax modules.