Second, cover flow feature in History view. If you visited several web pages during the day, you may wish to take a look at them again sometimes later. In my case, sometimes I forget the address or the detail so it may take hours to search and try to find them. In Safari 4, you can display my history using Cover Flow, and I can flip through my search result as easily as I am flipping my iTunes album art. It saves a lot of time and it as nice to see the cover page detail to make sure that I re-visited the correct web pages one more time.
Third, the speed of Safari 4 is awesome! I can not show any prove visually about this speed. But as I am still using Firefox at the same time when I tested the Safari 4, I found out that if I browse my Google Reader together both using Firefox and Safari 4, the webpage is pop up and show off completely faster in Safari 4. Some other reviews in fact claimed that Safari 4 is four times faster than Firefox. Try yourself for sure, definitely!