Recently, a number of spammers are using the 'referal links' area of awstats
to spam advertise.
An idea I had to get around these spammers would be that the referal urls
would have the ability to "ignore" - that with a simple click the admin of a
site could forever, or for a certain time ignore all referals from a domain.
that way, admins could easily weed out all the spam urls, from their actual
valid referal urls.