Windows XP
I'm having my first experience using Windows XP. My initial impression is that Microsoft has decided that it is futile for it to challenge Apple on the "ease of use" front, and that it has chosen to lock-in its advantage on the "incomprehensibility of use" dimension instead. E.g., whereas clicking on the little style box in the toolbar in Word formerly dropped down a list of styles from which you could choose, now it presents you with... well, I can't comprehend what. Good work, Redmond!