I vote for Notepad++ , because its very lightweight man….
zencoding(autocompletes like TextMate) works well here and it saves you more time…in coding html/css
you can zoom well the code using the mouse control
Syntax coloring are good…
some seperate windows for code reviewing…
and lol Notepadd++ is too easy to use
the only thing I wish for notepadd++ , is to support SASS/LESS syntax