Always looking to the future we've decided to give Safari 4 a whirl to see what's around the corner.
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The first thing that sticks out is the new 'Top Sites'. This is very much an overview page showing your most browsed sites. That might not be a good thing for some - but for us, we liked it.
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This can be edited by clicking the 'edit' button at the bottom of the window.
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This in turn reveals some controls for manipulating the results.
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Personally I would like to see the ability to explicitly decide which pages I want (not necessarily my 'top sites').
Looking through your bookmarks now gives you to use the ability to search in cover-flow mode. It's useful for certain situations and annoying for others. It takes a little time to update all the thumbnails.
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Search is improved and seems rapid from testing so far:
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From early testing browser rendering actually seems very similar, more time will be required to determine if we see noticeable speed increases.
Verdict: Thumbs up!