We primarily develop for the web. Most of the systems that we write are browser-based. However, there are situations where we write desktop based applications. Over the years, we have written code in practically every kind of server-side scripting languages such as PHP, JSP, ASP, ASP.Net, Perl, C++, Java etc. Similarly, we have used most JavaScript and ActionScripting frameworks on the client side.
Increasingly, we use PHP to fuel most of our product development. We do continue to take occasional side adventures into other languages such as Java, .Net, and Flex. A few of us even have soft spots for Python and BASH scripting.