I have a Windows box for work. I don't log out of it very often. I am really kinesthetically oriented for icons and window placement etc. So when a program crashes (damn you, Firefox 3.0.9 and 3.0.10, for being flakier than 3.0.8 and earlier!), I tend to quit all the programs that have taskbar icons to the right of that program, so I can end up with the "right" taskbar arrangement after restarting everything.
A few days ago, my boss pointed me at Taskbar Shuffle, which (without even needing a reboot!) allows you to rearrange your taskbar. Hallelujah.
<rhetorical>Why doesn't Windows come with this feature?</rhetorical>