Mostly the changes in Firefox 3.5 were on expected lines. Nevertheless it does bring in some new enhancements and is a noticeably faster browser. I think the (earlier) release of Chrome did take some shine off the speed increase but still on the whole it’s a welcome development. Lets see when others like Opera catch up, I am sure they will soon, it’s just a matter of time.
Interestingly, PHP 5.3.0 has been released with additions like namespaces, late static binding, lambda functions and closures to the language. I say these features should have been a long time coming to such an immensely popular language like PHP. These are a welcome enhancements to the language indeed. While this may not have any direct bearing on the client side speed of web applications, it does fill in some gap with other popular server side web languages.