I'm a fan lately of a program called Notepad++ for Windows. It's a straight text editor with syntax highlighting - you didn't say if you wanted WYSIWYG or not. If you do, I'd check out a program called NVU, or if you're looking to spend money, Dreamweaver. Microsoft Expression or Visual Web Designer Express might be good, too, but probably a little overkill. Good luck!

If you are looking for the perfect HTML editor that is free, you better download it straight from the guys that make the internet standards - W3 consortium.

This is the official page of the free editor called Amaya. http://www.w3.org/Amaya/

It is available for most OSes including windows.

Good luck

Notepad++ http://notepad-plus.sourceforge.net/uk/site.htm

Rhyan is right!
Amaya is a great program.

I also like Dreamweaver because of the wide range of uses; however, it is expensive.

I use HomeSite+ 5.5 and WeBuilder. Both are good. There's another one HTMLPad which is lower cousin of WeBuilder.

However, i oftenly use UEStudio(UltraEdit). It suppoerts almost everything i need and its my favorite.

I use textpad to write HTML code. It's just a text editor with some powerful features. Give it a try.

I'm a fan of hard coding. If this is what you need then I recommend the editor "Edit Plus" A user friendly editor with color coded function and easy one touch inserts. The ease to go from code to design page (separate pages) is a must. But then if you prefer "copy paste design" or "WYSIWYG" then I enjoy and recommend Dreamweaver 8, this is a must for every designer. Hope this helps. God bless.

Well, I use Aptana editor, it has JS debugger and it is useful sometimes

I have always (well, for the past five years) favored Dreamweaver, as I believe it to be a more or less complete solution. I know it doesn't come cheap, but if you can afford it you should definitely consider it.

Another great editor, if you're using a Mac, is PageSpinner. It's much cheaper than Dreamweaver, but a very competent software. You find it here: http://www.optima-system.com/pagespinner/ .