Adding YOURLS to my domain
I think the coolest part of having your own URL shortener is that you are always using your own domain as part of the URL. Even though you might be going to an outside site, the link you give ties to your URL.
Adding a bookmarklet to the bookmarks bar makes it easy an quick to create the short URL — much more convenient than going to another website, copy/paste the URL and then copying the shortened URL to your document.
Very cool.
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Example for "Adding YOURLS to my domain":
http://learn4growth.com/bookmarks/mathresource