In my shop, no development is done in Perl, but I am using Perl all the time. What? Yes, I am using Perl almost every day. I used Perl to make small but very useful tools for myself and my teammates. Two things really contributed to my success in Perl:

• It is such a power tool to deal with regexp, I don't see any other language can do it better;
• The development only costs so little time, so quick, and you can even make it GUI.

Here is a list of tools I made to help me and my friends:

• Some guys in my shop deal with IBM mainframe. It is really a pain whenever they need to make testing JCL's from production JCL's, and test something. I made a GUI tool, which FTP JCL's from mainframe, analyzing them, converting to testing JCL's, and finally FTP them back to mainframe. regexp, of course, and I also used Net::FTP and Tk.
• We recently got some C/C++ source code from another company, and need people to understand those source code. I made a small tool to allow programmers to view their C/C++ code in a tree view. The tool analyze the C/C++ source code and visually guide them through the calling/called function chain. Again, regexp and Tk.
• ...