Shortening Long Links for Twitter Posts

You want to tweet a link to a great article about Apple's new iOS 4, or a great app that you like, but out of 140 characters, the link itself takes up 100 of them. What do you do?

Let's say your tweetable link is http://www.pcworld.com/businesscenter/article/198758/goodreader_for_ipad_adds_vga_output_performance_boost.html.

Go to http://bit.ly/ and enter that URL in the URL Shortener, then click on "Shorten." The URL is shortened to http://bit.ly/dbhD2z.

Then when you hover over that shortened URL, it gives you the option to copy it to your clipboard, which you can then paste into your Twitter post.