Digg Bookmarklet
Easily check to see if any page on the web has been submitted to Digg by using this handy bookmarklet. Install it as a bookmark and, when you find a page you want to check, just click the bookmark and it will either load the page on Digg or direct you on how to submit it yourself.
Instructions: Click and drag the button below into your Bookmarks Bar. Can't see your Bookmarks Bar? Find and select "Show Bookmarks Bar" from the menu in your browser.
Can't see your Bookmarks Bar? Find and select "Show Bookmarks Bar" from the menu in your browser.
Address Bar
Another quick and easy way to check if a URL is submitted to Digg is to type in http://digg.com/ before that URL in your browser's address bar and hit return. This will either load the page on Digg if it's been submitted or direct you on how to submit it yourself.