Yesterday Google said and released search as you type. Most of you must have experienced it by now! Google blog for it is here Though it has fantastic speed to search at the speed of type, but my few points to put on table:
1. Do they need Search button now?!!
2. If search starts after a configurable number of characters wouldn't it be better?! Initial few characters, mostly, would not match with your search keyword. e.g. after 4 characters only instant search starts and you can set your number 4 in settings. Searching for first character I type has rare probability that it would give me correct search, than why to overkill?!