In the article linked from the iTerm2 page, it says that this:
echo -e $'\e]9;Growl Notification\007'
should trigger a Growl notification but it doesn't.
I've goofed around a bunch but cannot make it work.
Growl notification is definitely enabled in preferences. I don't know that I've ever seen a Growl notification from iTerm2, so perhaps there's some broken linkage but I don't know how to debug that.
Any ideas?