Windows 2003
Perusing over Roy's blog today, I noticed one of the most useful links I've ever found (well, this week):
How to convert your Windows Server 2003... into a workstation!
I know this will quite likely start off a debate, but yes, I've been using Windows 2003 for about a month and a half now. Yes, as my desktop.
I want the kind of security that it can give me (that XP can't), as well as better resource management. Some of us, for no good reason, really, still haven't upgraded from 128Mb of RAM. 2003 almost never tells me I have too little virtual memory, XP would tell me two to six times a week.
It's been only moderately annoying to get everything set up, once I realized that everything I needed was on the CD, and that it was good that it wasn't installed by default. (How many servers really need a calculator and sound anyway?)
I also read yesterday that Windows 2003 is as safe as Linux. Maybe that'll help some of you convince your SysAdmins that it really is time to upgrade.