The whole HTML validation exercise is questionable, but validating as XHTML is flat-out masochism. Only recommended for those that enjoy pain. Or programmers. I can’t always tell the difference.

Writing code? That's the easy part. Getting your application in the hands of users, and creating applications that people actually want to use - now that's the hard stuff.

If you don't have people that care about usability on your project, your project is doomed.

The whole HTML validation exercise is questionable, but validating as XHTML is flat-out masochism. Only recommended for those that enjoy pain. Or programmers. I can’t always tell the difference.

Teaching peers is one of the best ways to develop mastery.

You can achieve a shallow local maximum with A/B testing - but you'll never win hearts and minds.

We have to stop optimizing for programmers and start optimizing for users.