Is it "correct" to promote a commercial website when using a Newsgroup ?

Just put your ad in your signature, like I do.

Bill
--
Acme Builders
Fags smoked in your house, your tea drunk by the gallon, all project timescales
extended indefinitely, your virgin daughters cured.
We are skilled Prognosticators of Doom.
Try us and you'll never stop talking about it.