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Notepad or some other text editor like ultraedit (which has that nifty "preview" button). also, i've used webedit pro which is essentially notepad + a bunch of help and wizards for tables and frames and such if you get lazy.
this was all done with notepad/ultraedit / photoshop: www.controlgenie.com (shameless plug)
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-Fiddler
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Notepad at the moment, till I finally get round to rebuilding my system.
I normally use Interdev which I got as part of Visual Studio 6.
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Try everything, but don't assume anything.
If it gives you a buzz, do it again!