Can you point to an example or two where RDF is a "fantastic way to aggregate data..."? My sense is that things like microformats, which are more flexible and narrowly defined than RDF, are useful for this, too, but it hardly constitutes a "semantic web". It's just obvious connections between things. Something like a custom type of hyperlink is all. Not that this "all" is bad, it's just not going to revolutionize the world or anything more than the existing web already has.