The link to your blog on that page 404s.<p>But the idea is good. More and more apps are taking advantage of the string-to-date functions (PHP's strtotime and the like) and I think it's great. I'm now able to let my customers enter in just about anything.
The blog post he refers to --- <a href="http://simonwillison.net/2003/Oct/6/betterDateInput/" rel="nofollow">http://simonwillison.net/2003/Oct/6/betterDateInput/</a>