I used it when I worked at AOL for doing some customized load testing, then used it in a startup I co-founded afterwards as the worker in a queue system. CL was

I used it when I worked at AOL for doing some customized load testing, then used it in a startup I co-founded afterwards as the worker in a queue system. CL was probably the most stable part of our infrastructure. That said, I haven't seen much wide adoption of it, aside from companies that are specifically CL shops. However, I think as more and more people use it for side projects within bigger companies it may see more mainstream adoption.