Apple today released a public beta of Safari 4 for Windows and OS X users. My initial impressions are quite favorable (although the new javascript engine causes issues with Tippy that I have yet to explore), though I do not like the position of the tab bar. I think it's a mistake to put tabs at the top of the browser. I guard my screen real estate, but the amount of space taken up with the tab bar is excusable and I prefer having my tabs just above the page window rather than at the very top of the browser.

There is a fix, however. Users wanting the more traditional tab bar position can go to the terminal and enter the following:

defaults write com.apple.Safari DebugSafari4TabBarIsOnTop -bool NO