The Sidebar Bookmarklet extension slides out to shorten your long link, then shows Traffic, Conversations, and History. You can also share your bitly link on Twitter, Gmail, Email, and Facebook.
Just click on the new icon in the top-right Opera corner and the Sidebar will be loaded into the current page.
Note that after the extension is installed, the button will work only for new tabs. You have to reload old tabs to make the extension work there.
The most full-featured Internet power tool on the market, Opera includes pop-up blocking, tabbed browsing, integrated searches, E-mail, RSS Newsfeeds and IRC chat.