Google has acquired Metaweb in an effort to bring "deeper understanding" to the web. Deeper understanding, unless I've completely misunderstood, means penetrating beyond the words that describe things to the things (entities) themselves - I believe this is what is meant by the "semantic web." If you (too) have struggled to understand all the talk of "semantic web", the snippet below might help. It dawned on me while watching it that they're talking about those same exhilarating ideas we grappled with and discussed far into the night at library school - disambiguation, sign and signified, Ogden/Richards' semiotic triangle, etc. How quaint to see Google showing an interest in these things.