Marco Tabini just wrote about the new PHP search engine, BeebleX. I’m curious as to how the documents that it indexes are determined. I believe this is a perfect use for tags. What I mean by this is BeebleX could subscribe to the RSS feed on del.icio.us and Technorati for the tags, php and php5. This would then mean that humans are selecting what to put in the index. I wonder if they are doing this already.