There are GUI libraries for Common Lisp. CommonQt+qtools is essentially the gold standard, and everyone seeking to make a GUI application should use it.
I like the web, it lets me design applications with a precision native GUI tools don't have. And you can make an app that runs on the localhost and you can access through the browser: I do this for some applications I've written.
The problem is distribution: most users won't really know what's going on when they run an executable and it opens a terminal window and a browser window to some weird URL called 'localhost:41000'.
So I wrote this.
Also https://github.com/robert-strandh/McCLIM looks maintained but if it's anything like what it was a couple of years when I last looked at it, it could use some contributors :)
There are also at least 3 GTK+ bindings that I've seen around.
http://cliki.net/GUI lists 31 GUI libraries. We have enough for every day of the month :)
http://www.lispworks.com/documentation/lw70/CAPI-M/html/capi...
If the situation hasn't gotten better since then, well... what are people waiting for?
GP was to the point, but not mean and added something to the discussion (even if you disagree with it). You, however, were rude.