Very true, recently we were hiring for a DHTML position, and people that claimed they knew their stuff could hardly answer a few intermediate CSS/JS questions.

Granted, I came up with the test AND graded it, so at least it wasn't some HR person without a clue.

In this case we were looking to purchase a specific skillset as well. I don't know about most people, but I use a lot of technologies now that were never taught and barely thought of in college, so just because I have a degree doesn't mean I know anything about a specific technology (though I may be well prepared to learn it)