Pingchecker is a free plugin for WordPress that allows you to scan your post's content for
links, check the pingability of those resources you've linked to, and manually ping those
pages. This improves upon the inbuilt fuctionality of WordPress by allowing you to receive
the results of your attempted pings whereas WordPress doesn't. (With WordPress your ping
either appears in the trackback list or it doesn't, with no explanation or error codes.)

Also included is a workaround for a bug in the Wordpress XML RPC server that prevents many
of your pingbacks from succeeding without you even knowing about it! When you ping another
blogs server, it will check the page you linked, BUT because of this bug, sometimes it can't
find the link at all. This workaround adds a hidden div to your footer with your links so
they can be found, greatly improving your chances of a successful ping.

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