Timely snapshot. I wonder if Microsoft will feel compelled to add similar off-line support.
Some of the new features in Firefox 3 are not immediately obvious -- at least, not to the casual user. Among other things, Mozilla is incorporating new graphics- and text-rendering architectures in its browser layout engine (Gecko 1.9) to offer rendering improvements in CSS and SVG; adding a number of security features, including malware protection and version checks of its add-ons; and offline support for suitably coded Web applications.
Other new features -- some of which are listed here -- are more visible to end users, such as the menu bar that now appears asking if you want to save a just-entered password. Indeed, I've wondered if the browser will become top-heavy with built-in features that were already available as add-ons.