this features can be done easy using a classifier, and has been in the lab for ages,
you might also want to try their 'priority mail' feature, which does more sophisticated classification to prioritize your incoming emails.
actually, IMHO, google is slipping away from the simplicity and speed in its early time. Many of the recent features (instant preview, instant search, etc.) not only takes up much resources, but are absolutely *ANNOYING*
perform a random search, then on the right hand side of the search box, there should be 'instance is on', click it to assess the menu and turn it off. However, my understanding is that this preference is stored in the local cache (as a cookie), so it might not persist if you change a machine or clean the cookies.
All it does it to train a classifier based on your interaction patterns. However, I guess Google must be going a step further. They probably can learn some sort of 'signal' (either for you or for a group of people), and then can use these knowledge for better search result ranking or displaying sponsored ads.
Shallow NLP is okay and works reasonably well for simple tasks. However, don't expect it to work across the board. There are so many nasty cases and exceptions in living every language ...
perform a random search, then on the right hand side of the search box, there should be 'instance is on', click it to assess the menu and turn it off. However, my understanding is that this preference ...
sure, if nobody likes it, google won't release it to the market.
I found I am typing faster than what instant search can respond, and when i hit enter after the query, it might end up with the wrong query. In other words, instant search gets into my way.
For SEs, such instant search is beneficial as it lowers the workloads on the server side.