You know that if you go to google.com rather than google.co.uk then you can use ‘voice search’ I guess? (tip use ‘No country redirect’ if you cant do this – www.google.com/ncr).
This was a project developed for Google Mobile. There are a few other nice features developed for mobile devices and slowly being released. I did like traffic view in google maps – a very nice implementation but I didn’t know about “Search Along Route” that will find a specific service (eg petrol station) that is close to the route your taking.
Another nice one is voice guidance for walking.
Have a look at the other nice toys Google has to offer: