I started to test with Hunchentoot 1.0.0 too and I ran into the same problem with the hanging hunchentoot:stop.
As mentioned by Hans I installed some erlier versions of usocket. None of the 0.3.* and the 0.4.0 versions I tested worked well.
The hunchentoot:stop hangs until I make another request to the web server. Then the stop function terminates.
Kind regards, Daniel.