It also gives OSX RS-232 terminal emulation capability. As far as I know OSX ships with no other such program. Once you get your USB dongle's driver situation under control you just:
screen devicebaud
ex:
screen /dev/tty.usbserial-FTDPZOEJ 115200
Very useful for embedded system hackers and others who still need to speak RS-232.
I have not used a single other serial console since I accidentally discovered this feature in screen a few years ago. Hyperterminal, minicom, gtkterm, et. al. were the bane of my existence.
screen device baud
ex:
screen /dev/tty.usbserial-FTDPZOEJ 115200
Very useful for embedded system hackers and others who still need to speak RS-232.