The unreleased v64 is fraught with bugs, more so than v60! Although numerous features have been added to v64, new (and some old) problems have obviously cropped up. To release v64 in it's illegally available state to the public would mean to force users to put up with less site stability, trading for the abilities of tabbed browsing and auto-forms fill. Comments I've received indicate v64 isn't worth the trouble... yet.
I don't know that Apple has the resources to put a concerted effort into developing Safari at a faster pace than is already being displayed. I suppose, with the rapidly approaching release of Panther (OS 10.3), many considerations are being made towards the improvements and alterations to Safari... IMHO.
I guess we'll have to remain patient and hope for worthwhile improvements... when the time comes.
Hey RtC, given your careful nature where software updates are concerned, I should think you are two Safari updates behind. Why not throw caution to the wind and come up to the version before v60? That way, by the time v64 is ready, you'll be able to move to v60.
(Hmmm, seems you may have slipped into Bjornbro's Time Warp somehow.)
You can get a pretty good idea of the progress being made by tracking Dave Hyatt's weblog. Seems like there are some significant new features being added but that significant bugs have also been encountered. I guess Apple is weighing up progress versus headaches. I wonder whether the final feature set for 1.0 has been set? From Hyatt's log it sounds like there is still much under the hood, basic work, to be done (rather than adding new features).