>Yes.  They do.  Or, someone somehow involved with official Simpsons-dom does.

>Some time ago we figured out a strategy to test this theory.  The strategy was
>to come up with something sufficiently unusual that if we were to see it in the
>show, we would surely know it was from us, but not so unusual (or obscene) that
>they certainly wouldn't run it.

>People discussed various "mmm..." completions, like "mmm...usenet".  Someone
>who no longer seems to live here on alt.tv.simpsons but was a frequent poster
>at the time, who lives in Norway, suggested some preparation of fish which she
>and many others described as not worth eating (although enthusiasts also
>emerged), entitled lutefisk, with, if I'm not mistaken, an umlaut over the
>`u'.  So several people started posting "Mmm...lutefisk" and people added it to
>their .signatures, etc.

>Finally we were rewarded with an occurrence in an issue of Simpsons Illustrated
>in which Bart and Lisa go trick-or-treating and receive some lutefisk from Ned
>Flanders.  I find this fairly compelling.  The timing was as would be expected.