Doesn’t Windows’ built-in dialog for editing environment variables just suck? The one you get when you right-click “My Computer” and go to properties→advanced, I mean. It looks like a holdover from Windows 3.1 — a tiny, unresizable window that shows you at most part of five environment variables, and an “edit” button that leads to a similarly cramped and unresizable pair of forms which are never big enough.
Whenever I need to edit my %PATH% (which is often) I find myself copying the whole thing out of the Windows dialog, pasting it into Notepad, editing it there, and then copying-and-pasting back into the Windows dialog.
Enter the freeware Rapid Environment Editor, a sweet little tool that is infinitely better than the Windows builtin for editing %PATH% and all your other envvars without pain. Long semicolon-seperated environment variables are displayed as drop-down trees (like my PATH below), and it even highlights broken folders with red text!
It’s a quick 800kb download and the best thing to happen to me today.