Announcing the final release of the Particle System API, version 2.10. Check it out at http://www.particlesystems.org. It includes many improvements over 2.0 beta. Performance is optimized, often by a factor of 2 to 4. Linux Makefiles are improved. The documentation has been updated, and now uses Doxygen. The API has been used by hundreds of projects over the last nine years, and mentioned in dozens of articles, talks, and research papers.