The difficulty comes in having to browse through the hundred popular tags to find one specific language tag where you want to ask a question or provide help to people.

Granted, it's not that hard to do, but it's not optimal from a usability perspective.

For instance, PHP wasn't listed in the popular tags even though it's one of the top ten most popular programming languages (http://www.langpop.com/). To find this tag, I had to click Tags, search for PHP, and click PHP.