wget -r -np -l 1 -A zip http://example.com/download/
Options meaning:
-r, --recursive specify recursive download.
-np, --no-parent don't ascend to the parent directory.
-l, --level=NUMBER maximum recursion depth (inf or 0 for infinite).
-A, --accept=LIST comma-separated list of accepted extensions.
-r recursive
-l1 maximum recursion depth (1=use only this directory)
-H span hosts (visit other hosts in the recursion)
-t1 Number of retries
-nd Don't make new directories, put downloaded files in this one
-N turn on timestamping
-A.mp3 download only mp3s
-erobots=off execute "robots.off" as if it were a part of .wgetrc