ExperTelligence Inc has stepped up its effort behind Cambridge, UK-based Procyon Research Ltd for the Apple Macintosh (CI No 1,189): the company reckons that when choosing a Lisp compiler, the most important decision facing developers today is not which language is best, but which object system the compiler uses, and in order to promote the Common Lisp Object System and not embarrass customers that previously bought its own ExperCommon Lisp, it is prepared to provide such people Procyon Common Lisp free when they buy the Common Lisp Object System; the offer runs out on August 31.