What do you think about newLISP, a scripting language that claims to be a LISP dialect?
For those who still don't know it: http://www.newlisp.org/
For those who still don't know it: http://www.newlisp.org/
NewLISP is interesting for the space it occupies and it can be fun, but it also has some really wonky ideas that I think are mistakes and that will make it more difficult for you to grok other Lisps in the future. It is not a horrible language, but I think a person's time would be much better spent learning another Lisp. I would suggest that you Google comp.lang.lisp for newLISP. That should provide you with plenty of 'criticism' to digest. Several other people have asked the exact same question before on comp.lang.lisp.
Then, go to: http://gigamonkeys.com/lispbox/ once you've moved on ;-)
Actually I'm already studying Common Lisp (from the Practical common Lisp book), and, well, I really liked its concepts. And surely, it can be used for practical purposes. It's a different and old language, I believe it's worthy to be studied.
PCL is a great book. And, yes, CL is incredibly practical for many purposes. PCL/CL are much more worthy of your time than newLISP.
From http://www.softwarebyrob.com/2007/04/19/interview-with-lutz-...
"Lutz: newLISP started on SunBSD in the early 90's, then moved to Windows 3.0/1 as a 16-bit application, then to Windows 95/98 as a 32-bit program. During all that time newLISP was more like a hobby for me. Around 1999/2000 I made it Open-Source under the GPL license on Linux."
A nice feature is the ability to compile a newLISP script to a standalone executable that does not require a newLISP interpreter. I hacked together a quick and dirsty script that my colleages at work like a lot - a script that cleans up crap in their windows profile directory. :-)
I have no experience with other LISPs though, and thus am not competent to say whether newLISP is a "true" LISP. To me that really does not matter - as long as the tool does the job.
Good luck.
If you want to use a lisp then choose the one with the most vitality, aka SBCL.