Google could be superseded?

So says Tim Berners-Lee in this article on the future of the web, search and semantic technologies over on the Times website.

I tend to agree with him unless Google move into the semantic search space pretty quickly. With Yahoo announcing support for semantic mark-up within their search index Google will surely not want to be left behind.

I'd like to think the future of Google will embrace semantic technologies and make it a real 'discovery engine', surfacing links of high relevance to searchers through much stronger understanding of the content within.

As an aside; one thing I've been thinking would be a nice app would be a semantic web robot which you could set off to scour the web for content and with the added semantic features (rather than the more usual boolean profile based robot) it could learn as it went by allowing you to score results for relevance to you. The first really intelligent agent?