and what the heck is a "¬"

word 2000 (9.0.44.02 SR-1)
wordpad/notepad v5.0 (Build 2195: Service Pack 3)
msn messenger 4.6.0082

and so on and so forth. If I need a tilde in an URL (or in a post here) I have to type ~ and then space, at least when the next character is ‘tildeable’, like ã ñ õ…

Maybe it depends on the keyboard…

Yup, it does. If I switch input locale to US English in the keyboard settings in control panel I just get the characters. When I can find them.

(here’s a link to scandinavian keyboard layouts)

Eh, here’s the link: http://www.macromedia.com/support/fontographer/ts/documents/scanda.htm

And if you search for ‘typing accents’ on the net you’ll find out how to configure windows to accept this type of input from american keyboards as well.