the new safari 4 beta download is available for download here. and among sum of the tweaks are a new tab appearance, and cover flow view for quite literally everything including internet history and booksmarks. but the creme de la creme is what i have lovingly deemed command central, a stacked grid-like view of your top sites!
not only can you add, delete and rearrange said top sites, you can also customize the view from large, medium and small, which basically increases or decreases the amount of sites viewable on the page. pretty awesome!