I would definitely recommend taking a look. Formats are
the kind of thing you learn how to do once, then go back and
look it up in a reference manual when you need it six months
later. :-) Write formats are good for plain text reports,
nice debugging output, log files, that sort of thing.
The reason you probably haven't seen much of it around
here, or around other "mentors", is because pretty much
anything fancier than "*** SQL: warning, could not prepare
statement" is usually a good candidate for Tk, X/HTML, or
something along those lines. Knowhutimean?