HTML-Edit is a good multipurpose editor that has many plugins for different functions and a plugin editor so you can write your ouwn plugins. I like it mainly because I can have code colouring per language with multiple documents at once. I am sure other editors can do this but this was the second one I found in Windows I liked. I also like arachnophilia but the ability to add custom commands to it was not as fluid as HTML-edit. Though this is my opinion please check out the links posted above try out a few pieces of software and see what you are the most comfortable with.
"No matter where you go, there you are." BB