There is Google Blog search. With this small recipe you can ping it everytime you change a page in your wiki: Cookbook/GoogleBlogPing. It uses the API here.

As promised before here is the Pingback support for PmWiki: Cookbook/Pingback. It supports receiving and sending of Pingback request, now even much more elegantly by using an “pingback” action. So no logic needed anymore to map your page urls back to pagenames, thanks to Crisses for her reference to the xmlrpc recipe which gave me the idea. Just include the recipe into your config.php, that’s it. Couldn’t be easier.

I am halfway in implementing support for Pingback in PmWiki. Pingback is an open specification to notify your website (often Blog) that somebody else has written about it (and therefore put a link to your site). This is implemented in some major Blogging software like Wordpress and several websites like news.com. There are still some issues, which maybe need changes in the core for a clean solution. But the basic stuff is there. So ping 1stein.org and get listed as related page for an article.

Update: The timeout problem, which caused the HTTP 500 error, is solved now, look here.