The watchword feature is nice, however it doesn't really work for my use cases. I really don't want to give out a bunch of emails that start with the word red or something. So I usually leave watchwords off.
However, there are a few addresses of mine that get hit with spam regularly. Recently they've been altering the first part of the address, which creates a new spamgourmet address (since I don't have watchwords enabled). Since they use the same root word, I'd like to put "datek" on my anti-watchword list, which would auto-spam-can any new address with that word in it.
btw: I really love spamgourmet -- that's for providing this service.