The URLs of many web sites are long and hard to remember. It's also painful to type them in full in the omnibox. You can create a bookmark for it. However, the number of bookmarks you can put on the bookmark toolbar is quite limited. A good approach to this problem is to create a short alias mapped to the original URL. After the alias is defined, you can simply type the alias from the omni box to reach the destination web site quickly. Here is a screenshot of the alias definition dialog,
For example, you can type "fy" in the omnibox and the site http://finance.yahoo.com will show up as the first match. All you have to do is to press enter to go to the Yahoo Finance website.
To quickly define an alias for the current website, just right click on the tab and select "Create Alias" from the popup menu. You will be prompted with a dialog as shown below,
Click Ok and the alias is ready for use.
To manage all the aliases you have defined, you can go to the settings page by selecting Settings from the browser menu and go to the Omnibox section. Then click "Alias definitions" button to open the alias definition dialog.