When you query Google, you'll notice suggestions appear to assist you in your search. They appear as a list in a drop down menu. This feature is known as Google Suggest and became default on the homepage in August 2008. Now, that menu is getting additional, universal features.
Let's say you're wondering what the capital of a country is. As you're typing, the answer may appear directly in the Suggest menu:
Also, you might want to check the weather. So you search and a forecast appears in Google Suggest: