if the webmaster ever needed to do away with referrals so save money on bandwidth you could just post search engine link that searches all of craiglist. like this one for example Here im sure there are others out there too.
What I wouldn't like about that is that a good number of referrals don't come
from Craigslist. In fact, I think the others are the most useful because they are harder to find by a general search. Examples would be those from a local paper's classifieds, from an obscure online listing, or from someone driving by a trailer with a "For sale" sign in the window.
My hope is that the referrals stay as they are - I can simply scroll past them if I'm not interested. I might feel differently if there were hundreds (and sure, if it's customizable that "view new posts" not include referrals for those who don't want to see them - great! I wasn't sure that was possible)