I don't know he methods that the other mods use but having a list of spammer's names would not help me. There would still be spammer's names that don't make the list and we would still have to look for them.
Whenever I come on the site, provided I have time, I look at every single new post in the english section to make sure they are all porn/spam free. It is time consuming, as I'm sure you can imagine.