If Dreamweaver is a bit overkill for some web work on your desk, Taco HTML might just be the editor for you. It's a small yet feature-packed web editor with tag coloring, HTML preview, syntax checking, code snippets and more. It's my favorite editor for HTML pages or tweaking a WordPress PHP page file or two.
As far as I can tell, Taco HTML is provided free, and is a Universal Binary. Check it out if you read this post in less time than it takes Dreamweaver to start up.