I'm interested in learning the source of all those spammy URLs reported in Yahoo! Site Explorer. If the site owner honestly doesn't know how they got there, I'm curious to learn about their origin.

They appear to all be WordPress posts/comments, largely in French and they exist on multiple 3-character subdomains, such as (edit URL CD)

Is this some form of hijacking?

I notice that the "links" column on the right of each page contains links to multiple external domains including a lot of porn sites.

I recently had a client's blog hacked to insert a script that used user-agent detection to serve spammy content to Google and error pages to real browsers. So, I'm curious to stay on top of these things and find ways to detect and prevent them in the future.

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Jade Burnside, Ahead of the Web
What good is your web site if no one can find it?
SEO & Optimized Web Site Design