As everyone knows, there are software products available that can really increase your productivity. I thought I would list a few that I use regularly.

• Most web developers know about Firefox, but not everybody seems to know about their Web Developer extension.
• Virtually nobody seems to know that there is Web Accessibility Toolbar is available for IE6.
• While html editing software often has validation checking capacity, an on-line html validator is also very helpful.

Update: A more complete list of add-ons I use.