* DNS-based URI Blocklists: SpamAssassin has had great success using
Jeff Chan's Spam URI Realtime Blocklists. When an e-mail arrives,
SpamAssassin extracts the urls contained within and performs a few DNS
TXT queries to find whether the url has been reported in spam. These
blocklists can be used for weblogs too.
The tools I know of for dealing with DNS in PHP are not particularly robust with regards to timeouts and such so they sometimes introduce unacceptable delays into the normal operations of a website. However most all weblogging tools have some sort of XML-RPC toolkit for dealing with the various blogger APIs, so a web service equivalent to anything that's set up would be very convenient. I'm not familiar with the scaling issues these services might face, so I don't know if that's practical or not.
-- Matt Mullenweg http://photomatt.net | http://wordpress.org http://pingomatic.com | http://cnet.com
