There _was_ a later Safari version [3.2] that had some bug fixes. [I have that version running on an elderly iMac G3] But, that is probably no longer available with the release of Safari 4.0

I would not currently recommend Safari 4.x to anyone [I think I have a conflict with a 'click to flash' plugin, but it may be the browser itself.]

I would recommend downloading Firefox [or it's slightly more mac flavored version 'Camino'] and seeing if there is any improvement when using an alternate browser.