The Reader function is probably the most innovative feature in Safari 5. What it does is, detect articles on the page and strip away all the unnecessary stuff – ads and all. It will even combine the pages of a multi-page article. I cannot think of another browser that comes with such functionality by default.
This cleaned-up view can be printed or emailed too. While Safari 5 Reader won’t show ads, it will still request them from the server. I’m not sure advertisers will be too happy with such phantom ad views, but still.
The Reader feature in Safari 5
The URL suggestion in the address bar was improved – it now looks for matches in the whole address, not just the beginning like Safari 4 (e.g. Safari 5 will match ‘arena’ and ‘gsmarena’, but Safari 4 won’t). Also, instead of just looking through the URL, page titles will be considered as well – which makes the URL suggestion a lot like the one on Firefox.
Safari 5 is faster than all other browsers in the SunSpider test (tested on a 3.06GHz Core 2 Duo Mac)
They also added DNS lookup, a feature that Chrome recently got. This helps reduce the time it takes to open a page from the moment you click on a link.