Besides Expose and many other features (incorporated speech function since the first Macintosh), there are...
No forced reboot that causes you to lose changed to unsaved files (the default Windows behavior), if MS determines if some update is important.
Windows Antivirus failing
http://www.heise-security.co.uk/news/100900
No limit on RAM access. In Windows, to access more than 3gb of ram, you need the 64bit version of windows which lack drivers. On a Mac, if the hardware supports it, you don't need to pay extra for a less capable version of the OS (that lack drivers) to access the RAM you bought.
No need to wait 10-20 seconds every time you plug in a New USB device (even a friggen mouse), for windows to "install drivers".
OSX auto detects external displays and projectors. No need to press some key combination to "detect" displays.
Easy multi boot with internal and external drives on a Mac. (Easy to boot OSX, windows, even Linux using a thumbdrive).
No idiot ballons.
Benchmark the same computer using OSX and windows. Same computer running OSX score > XP score > Vista score.
Macs accurately display fonts with proper anti-alias, instead of windows which over-sharpens fonts thus look different than printed version.
Many windows programs cannot open multiple files with the same saved name.
Windows key during games. If you press windows key by accident during an app that uses full screen, windows will switch from the program and open the windows menu, you will then have to switch back to your app. Waste of time.
XP: use accounts are not separate. Somehow desktop shortcuts in windows XP are universal for all users. I.e. if you create a new admin account, your new admin account will see the shortcuts that the other admin account made. if you delete a shortcut from an account, it's gone from the other user's desktop.
MS products such as I.E. 7 blocks MS' own products such as visio from opening properly unless you go through a bunch of clicks with every file. LOL.
Mac OS X:
Installing 100 apps will not slow down the system as long as the apps are not running.
Switching between multiple intensive apps quickly will not cause the system to slow down.
Ability to run for months without slow downs.
No need to press start to shut down a computer.
Mac OS X:
PDF maker system wide, can make anything printable into pdf
Print Preview available system wide, can preview in any app