Search for "weather 94025" on your mobile phone. What Google has done is very impressive. First, the search result is overtaken with a weather forecast (similar to other 'smart search' categories like sports scores, news, etc). Second, Google has used HTML5 to effectively create a lightweight application within the browser. As you shift the slider, the weather, temperature and skyline color change according to to the time. The interaction is fluid and occurs instantly.

Obviously Google has also done terrific mobile work on their apps suite (ie GMail, Calendar, Docs, etc). And they are motivated to make the mobile web components work rather than core applications... which would have to work work cross-platform / device.