Web developers are taking a cue from the Grey Album and mashups have become increasingly in vogue. The one that triggered this post was AudioFlickrscrobbler which finds photos related to the music you’re listening to; but web service mashups seem to be everywhere these days.
The Semantic Web is all about remixing and linking and sorting data. All you do is import the data you want into a triple database like Redland or Jena, then run a SPARQL query to find all the linked data you’re looking for.
Also, I love microformats and I think they are a great bridge, but they can be limited.
That said, I think that for the Semantic Web to take off microformats will have to take off first. Once people start getting plugins that allow them to add embedded microformat data into their apps (like a script to add hCalendar data to iCal) people will demand that the web interact with their personal data stores. From there, it’s just a matter of time.