Here is a list of all related documentation pages:

OpenSNES — Design Philosophy
Compiler Benchmark — OpenSNES vs PVSnesLib
DSP-1 Coprocessor Tutorial
Interrupts: VBlank callbacks and timer IRQs
Hardware verification protocol
Upgrading from 0.48 to 0.49
What 1.0 will freeze
Known Limitations
API index — by what you are trying to do