The developer tools have been steadily improving, apart from that I can't recall to much exactly.
Will be interesting to see if Firefox can keep to their new release schedule after 4. Otherwise it seems that Chrome just iterates to fast compared to Firefox. Chrome 9 is a long way ahead of Firefox 3.6, sure Firefox 4 might even it up but if every release has this kind of beta time Chrome will just keep skipping ahead.
Hey, there you go. I noticed some great additions to the Inspector.
I'm pretty sure that the reason I can't come up with the differences is that the change is so gradual. I know Chrome has been improving, it's just not a dramatic change like FF 1 to 2 or IE 6 to 7. But Chrome 4 to 9 doesn't even seem like a dramatic change. if they were using normal versioning, I don't even know if it would be time for Chrome 2.0 yet.
Will be interesting to see if Firefox can keep to their new release schedule after 4. Otherwise it seems that Chrome just iterates to fast compared to Firefox. Chrome 9 is a long way ahead of Firefox 3.6, sure Firefox 4 might even it up but if every release has this kind of beta time Chrome will just keep skipping ahead.