I’ve only been using the new version of Mac OS X for a few hours, but I already like what I see. As others have commented, many of the most satisfying changes are simple clean-ups that should have been done years ago. Like this one:
Notice that the icon for iCal has the actual date, not “Jul 17,” which is what it had since iCal was introduced 5 years ago (on July 17, 2002).
This has always bothered me. So much so that I refuse to quit iCal. I just hide it everytime. That way the date stays relevant.