There really is no good reason to not allow users running under restricted privlege to view the system clock and calendar in Windows XP.

In general, I think we need to get away from the IT mindset when it comes to our consumer operating systems like XP Home and Pro, etc. The average user just doesn't get Admin, Power User, etc. In fact, most users run as Admin since that is the default context. This is a security risk. C'mon. 

Reboots after install/modification suck. End of story.

App hangs are still too frequent in XP. I have to have Task Manager running in my tray... Speaking of which:

The process viewer in Task Manager is not very useful to the average user. In some cases, even the most experienced users have a hard time determining what running processes named svchost.exe or mdm.exe, for example, actually are; they could be anything! And I don't like that from a privacy perspective. Hey, I'm paranoid. What can I say?