BrandSpankingNew

Particletree have developed an interesting solution to replace trackbacks (which I deactivated long ago due to the sheer amount of spam generated, compared to the handful of genuine trackbacks) using Google Blogsearch.

Thanks to RSS, XSL and a little PHP ingenuity, we can place the results of a URL search of any entry directly on our site without the need to go to another URL.

A simpler implementation might to cache the incoming referers for each page, filtering out the search-engines, and list them instead. Then you'ld not be reliant on a third-party service, nor would you infringe on Google's Terms of Service.