David Wood's new blog, is where he sits down and gives us a vigorous, new article "Making the Semantic Web Viral": "The Semantic Web has not undergone the explosion of users that caused the early World Wide Web to be successful...The barrier to entry is currently substantially higher than it was in the early Web."
"The way I see it, Web links with semantics need an attribute on a hyperlink that defines the relationship between the resources...Once you have links with semantics, you need to provide a means of navigating from the existing Web to the more abstract space of RDF and back again. You can already link a Web page to another Web page, but what do you do when you want to link to a person? Representing people as email addresses or even FOAF files is weak, silly and just plain insufficient. People exist only in Meat Space and so have to be represented in Semantic Web Space by some non-trivial means. RDF & OWL already provide a great answer for this: A person object can exist that link to email addresses, FOAF and all the rest. Now we only need a way to navigate it via the Web."
I'm not sure if this is anything like what David wants but I recently came across Cocoal.icio.us. This is a nice OS X client for del.icio.us. The screenshots shows a user searching and adding metadata.