You can install it from the installation.html1 page on the del.icio.us trackbacks google group. Feel free to use that group to post any questions you have too.
Current features:
Scans the html of the page you’re bookmarking looking for a link (anchor) with a rel attribute whose value is trackback.
Sends a request to the trackback URI if it was found.
Records (by adding the ‘dtb-sent’ tag) the sending of the trackback so that we can avoid sending multiple trackbacks to the same site.
Records the success (‘dtb-success’ tag) or failure (‘dtb-failure’) of the trackback request.
That’s all for now.
1 I don’t appear to be able to link directly to that page which is a bit odd.