How to get short urls for any site url ?

There are limitations to write sms or message like on Twitter , OR may we feel difficult to note or remember long urls. There are some sites helps us by converting those long urls into short.

Some of them are,

• http://is.gd
• http://bit.ly
• http://j.mp
• http://tiny.cc

Note:Google URL Shortener(goo.gl) is currently available for Google products and not for broader consumer use,but you can use above sites for short url.

Example:
I tested with my blog url (ldigita.blogspot.com) with http://is.gd and the site make a short url for my site is http://is.gd/em6vf.