Frank Zappa once said that "Rock journalism is people who can't write interviewing people who can't talk for people who can't read." Sometimes I think #lisp is a bit similar... :)
http://meme.b9.com/cview.html?channel=lisp&start=3368462909&end=3368463023
OK, nobody has asked, but here's the answer anyway: RTFM where it says (right at the beginning) that you should use SEND-HEADERS "if you want to serve very large static files."
http://weitz.de/tbnl/#send-headers
SEND-HEADERS has been in there since 2005 (version 0.9.0) and it is used in HANDLE-STATIC-FILE (html.lisp) as well as in the UTF-8 example.
Cheers, Edi.