Webapps, unsurprisingly. Enough to know that I was using the wrong tool when I burst out of my little bubble and opened my eyes. I've since written/played in more languages and problem domains than I can be arsed to type, and not once I have I said to myself "You know what I need for this job? PHP."

Edit: I totally lied, there was an occasion where I had that thought. A friend of a friend wanted the year in her otherwise static site's copyright notice to auto-update. So I emailed her a snippet to paste and told her to change the file extension.