Google have updated their search page, now when you start a search you not not have to press the enter key or button to do the search, the results appear below the search box as you type. I suspect that it waits for a slight pause, the displays, as you type more stuff the search results get updated. This is not the suggested search terms that they have been providing for some time, it is much much better than that. Here is a screen shot of the thing in action.
This is will probably have the effect of shaking up the SEO market, as the way websites will appear at the top of the search results will change some what. You will need far few words before the results appear!
The adwords market may also be affected, not sure how though. The ads appear as you type also, this means that for example if you type “oil” you get ads for oil spill kits, (BP might be responsible for that!), but then if you add the work “tank” the ads change and you get oil tanks adverts. You can see how this is different the user has seen two sets of adverts, and one of the set was for the wrong thing, but the user may have eye balled them.