Ltk seems like a fantastic idea. I don't personally use it, but I like that there's a fairly simple and easy option for people who want to make a GUI with Common Lisp.
Unfortunately, it doesn't build on SBCL any more. SBCL exports sb-ext:exit (eventually replacing sb-ext:quit), and a package in Ltk triggers a package lock conflict because of it. I've emailed Peter Herth about the build failure, but a few months have passed and the problem persists.
Does anyone who reads this blog use Ltk? Would you be upset if Ltk is dropped from Quicklisp until the issue is fixed?