To get episodes 1 through 100.
Modify for your needs.
Linux:
for i in `seq -w 1 100`; do wget http://cisx1.uma.maine.edu/~wbackman/bsdtalk/bsdtalk$i.mp3; done
BSD:
for i in `jot -w%03d 100`; do ftp http://cisx1.uma.maine.edu/~wbackman/bsdtalk/bsdtalk$i.mp3; done

http://bsdtalk.blogspot.com