Forget all the new features for a second ... Safari 5 has something else going for it.
Although I use a Mac Pro 8 core, MacBook and all the latest toys I also use an old iBook G4 a lot for web surfing to test web sites across the range of hardware and well, I just like it. It has 512 MB and runs OS X 10.5.8.
Ever since Safari 4+ web reading has been a real pain on the iBook. The poor thing's hard drive never stopped accessing when on the likes of CNN's web site. Even with Click4Flash the fan soon was on and it got hotter than hell. I suspected it was about time to lay it to rest.
Enter Safari 5 last night...
The iBook is silent, it seems to hardly ever access the drive, it is lighting fast (dare I say very snappy) and plays videos again (it was too slow to even try). It is like a new computer! I haven't had much time to test on higher end and newer Macs but this little machine is the 'Mac that could' again! Thank you Apple