All serious web developers understand the importance of having high-quality tools every step of the way. For example, once I've got a page mostly complete, I'll use the W3C Validator to validate the HTML and CSS, run it through Vischeck to make sure the readability holds up for people with color blindness, and perform a handful of other tests and checks. It's somewhat time-consuming, but absolutely essential to creating a good product.

Well, I was absolutely thrilled when I found The Scrutinizer. This fantastic tool is like a jumping-off point for all the various  web tests. It consolidates all the tools I use on a regular basis, along with many I'd never heard of but will now make part of my regular page-test regimen.

The Scrutinizer automatically pulls in the URL of the referring page, or you can enter your own; from there, it's simply a matter of clicking the relevant links to run the various tests. There's also a bookmarklet for Firefox to make the process even simpler.