Mozilla released Firefox 3.5 today as previously expected. There's a lot of info out there:

Product overview

The Fastest Firefox Yet

Things move quickly online, and we’ve beefed up the engine that runs Firefox to make sure you can keep up: Firefox 3.5 is more than twice as fast as Firefox 3, and ten times as fast as Firefox 2.* As a result, Web applications like email, photo sites and your favorite social networks will feel snappier and more responsive.

More Ways to Keep You Safe

Keeping you safe while you surf is our top priority, which is why we’ve upgraded our anti-phishing and anti-malware technologies and have added private browsing and “forget this site” options to ensure your privacy.

Plus, our open source security process means we have experts around the globe working around the clock to keep you (and your personal information) safe.

One Size Doesn’t Fit All

Everybody uses the Web differently, so why should your browser be exactly like the next guy’s? Whether you’re into chatting, cooking or coding, Firefox has more than 6,000 add-ons to help you customize it to fit your exact needs.

Advancing the Web

We’ve been working hard to make sure Firefox 3.5 brings you the best of the modern web. With new features like private browsing, tear-off tabs and enhancements to the Awesome Bar, plus major performance enhancements, you’ll enjoy life on the cutting edge.

See How We Stack Up

We’ve told you about what makes Firefox great, but how do we compare against Internet Explorer? Check out our handy browser comparison chart to see for yourself.

Plus, you can watch a Firefox 3.5 video tour. Or just download it.