I'd do some basic editing with vi/vim if I had to but would rather not. I stay away from email.

I've produced more HTML via php than I have just writing html but either way, a text editor would do. On Linux, Kate and KWite would suit me. I'm not sure about Window but Notepad++ looks like a candidate.

I've nothing against an IDE such as (possibly) Eclipse either. I'm not sure what that one offers but something with a Wysiwig HTML editor need not also provide decent text editing.