Resources for JavaScript Performance

I've been doing some research on AJAX best practices of late and found a few links worth sharing / archiving:

• Best Practices for Speeding Up Your Web Site (presentation)
• YSlow: Firefox extension from Yahoo for evaluating site performance with Firebug
• YUI Compressor: Compressor for CSS, JavaScript

Yes, all are from Yahoo, but all seem to be useful, especially the tooling.