Welcome to Dark Chestnut.
I blog here on Common Lisp topics, mostly about things I encountered while building a production grade web application.
Run Common Lisp web applications in the cloud.
Although Verbose is one of few logging libraries that work with threaded applications (See Comparison of Common Lisp Logging Libraries), I had some trouble getting it to work in my application. I have a Hunchentoot web application which handles each request in a separate thread that is built as a standalone executable. Getting Verbose to work in Slime was trivial but once I built the standalone, it kept crashing.
Sometimes it may be necessary to execute an external command that takes a long time to complete, long enough that the user needs visual feedback while it is running to show that the process is still alive.
How to process sub-command style command line arguments is a question that arises more and more. Many of the basic option handling libraries can not handle this at all, or they make it very difficult to do so.