Alan, author of CogDogBlog, posted a great write-up of how you can use Google Spreadsheets to create dynamic web pages with ease. It’s not a replacement for PHP and MySQL, but it’s a healthy supplement for when you want to add functionality without getting your hands dirty with lots of code. It’s also a create resource for those not comfortable with developing in PHP and MySQL.
Updating Web Sites with Google Spreadsheets (via CogDogBlog)