I just got in from helping my good Swedish friend Hans sort out some stuff on his PC. I showed him Noscript on his XP desktop, and he reckons it's brilliant. I left him installing it on his Vista laptop.
I've been using it for so long I'd forgotten what a mess things look without it.
I'm amazed to hear you use IE6, IO540. I've been a 100% Firefoxer ever since I moved on from Mozilla. IE went the way of all flesh a very long time ago.
Sadly, the Firefox offering for Windows Mobile devices doesn't hack it. I'm learning Opera for the pocket device: it works well, but with one bug - it hangs for ten seconds or so every so often.