I keep hearing about these killfiles. Whats all that bout then?

It just refers to adding certain posters to your blocked senders list. While
reading postings on Usenet it becomes quickly apparent that some peoples
reason for posting is simply to be offensive to anyone and everyone. If you
are not interested in the ramblings of such attention seekers, adding them
to the killfile is a way of filtering out their crap from the posts which
are worth reading. If you are using Outlook Express and you have just opened
a posting that you consider is posted by a troll, click Message Block
Sender. There are similar options with other newsreaders. Think of it as
weeding!