Gmail is always able to take the experience with emails to the next level. Sometimes it is just a small change that makes a big difference. Started with 1GB storage space for your emails and search facility to search your emails. They have added a small feature to search to make us bit lazier and easier. This is what Gmail has to say about their new feature.
"On the Gmail team, we believe finding the right email among thousands of messages can be as important as finding the right web page across the billions of web pages out there. So with the aim of making search in Gmail easier, we built a new experimental feature in Gmail Labs: Search Autocomplete. Turn on Search Autocomplete from the Labs tab under Gmail Settings, and you'll get suggestions as you type in the search box. One of the most popular searches in Gmail is for names or email addresses, so the first kind of suggestions you'll see are contacts. Some names are not easy to remember (my last name is an excellent example!) — with this new Labs feature you can just type a couple letters and select the desired contact from the drop down list. Easy and quick as that."
Official Gmail Blog: New in Labs: Gmail search made easier (and lazier)