In the past months I've been working on an I/O library: sockets, a basic DNS resolver and I/O multiplexing(only select() but soon I'll add epoll and kqueue support). At the moment I've put the sources in cl-torrent's public_html:

http://common-lisp.net/project/cl-torrent/darcs/iolib-alien-ng http://common-lisp.net/project/cl-torrent/darcs/iolib-ng