We have been running a poll for the past couple of weeks over at LispForum asking people to tell us which Common Lisp implementations they use most. I don't think it would surprise anybody that SBCL is leading the poll, but it might surprise people as to the magnitude. Currently, with something like 97 votes in, SBCL has 53% of the votes. The next most popular implementation is CLISP with about 18%. This is followed by a tie between ClozureCL (OpenMCL) and Lispworks.

My takeaways here are the following: