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Notepad is undoubtly BEST
But Notepad is awful! A text editor for web development needs syntax highlighting at the very least, so you can see at a glance where the tags are and spot missing brackets, quote marks and the like. If you're on Windows, try Edit Plus, or on Linux, Bluefish.
I never use a wysiwyg editor, so I can't make a recommendation there.
The character was invisible in notepad but not to php, it crashed the whole script.
I found the character immediately when I opened the page up in Editplus.
The moral of the story is don't use MS stuff to work on web pages, Edit Plus is the best text Editor I've seen for windows, for a very good WYSIWYG editor I'd vote for dreamweaver, but I've never used the other products recommended here so they might also be very good, but dreamweaver is a good one to learn on.