Covered the rise and rise of Google last night for World Service Newshour. In August last year, when the stock was floated, people were saying it was overvalued. Less than a year later, Google has nearly trebled in value.

What's going on?

Like Hoover, Google is now a verb, and people ask "Have you Googled it?" in response to a question.

I still feel the same as last year. If Google can come from nowhere to where it is now, in such a short space of time, what's to stop something else rising from nowhere? Microsoft and Yahoo are not far behind with similar search technology.