In this new post to reddit.com the question is posed, "is it better to be an expert or all-arounder in web development?"

Is it better to be an Expert in a framework like Zend (a certified Zend Developer) or know a little bit about everything. [...] In sum, it's just taking too much time for me to master Drupal, Magento, and other popular CMS/Frameworks. So I'm wondering if I should just specialize is one framework/CMS.

Most of the comments follow along the same idea - it's good to be an "all-arounder" and know several different technologies, but it's also good to be an expert (or as close as you can) in one or more technologies. As one comment puts it:

In my experience, it's best to have a specialty, but not have a too narrow focus. There's a lot going into a web site - programming, design, usability, marketing, economy, etc. Understanding a number of those fields makes it easier to work with other people.