Building faster web sites

There are lot of performance improving tips out there in the Internet on how to speed up web pages. Recently I came across these references and tools that will be useful.

1. Steve Souders from Google presents "Even Faster Web sites"
2. YSlow from Yahoo!. A firefox add-on that analyzes web pages and tells you why they’re slow based on the rules for high performance web sites
3. More website optimization tips here
4. Webpage performance analyzer here