One of my favorite features in Google Chrome, and something that I discovered by accident one day, is how the address bar lets you search any site in which it detects a search field.
If, for example, you type “wiki” and press tab, based on your browsing history, it will determine that you most likely meant to search en.wikipedia.org. It will show a blue “Search Wikipedia (en):” element, and you can type in your search term and press enter. You’ll be taken right to the article on Wikipedia.
This works with most popular sites out there. I’ve used it with Netflix, Google Image Search, Wikipedia, Facebook, Stack Overflow, php.net, and of course, YouTube.