How long does it take for ink to get "old" in your opinion? Also,
if it does clog, what recourse is there? Do I have to get it
serviced or does it have a built in cleaning utility? I'm thinking
of an i850 or i950. Thanks!
I would consider 12 months as old. I have seen some weird particles
beginning to settle in a 9 month old yellow cartrige I found under
my desk (I should clean more often - grin

. The printers do the
standard inkjet cleaning stuff but the head is easily removed and
can be flushed with windex, distilled water or alcohol (according
to a Canon rep I spoke with). For anything more serios Canon has
been very good with replacing the heads. Someone even got a new
head even after the printer was out of warranty.