SBCL, mzScheme, and Clisp. I got SBCL and Clisp to work.
I'm having trouble explaining why I had such a hard time, but I think that's because I was a noob at the outset, but I'm not such a noob any more. Sure, now I can install Lisp on a friends computer in a day, tops. For good hackers, installing lisp is trivial. Of course, there are lots of things that good hackers can do in a tiny fraction of the time it takes anyone else. But from a noob's perspective, everything is very different. There might be a place that works, but there are many that don't, and those dead ends are really going to set you back.
Maybe I can't see things through a noob's eyes any more, but for whatever reasons, installing lisp took me two months, working full time.
I confess that I had a struggle to get the Oracle bindings for CLISP working on Linux (3 days full-time work, and I am very experienced with build issues on that platform), and I still haven't been able to do it on Solaris. Getting Oracle bindings for Tcl or Python was trivial, literally minutes of effort, including the download. So yeah, LISP does have a long way to go. I can use it on (some of the) kit I control, but forget deploying LISP apps anywhere else in the organization, there's no way I want to be responsible for building and maintaining it on the plethora of platforms and versions we have.
