People who follow me on Twitter know that most of the links I send have been shortened by Bitly. However, when "Tweeting" a link from my iPhone, it's generally difficult to get the URL in my Twitter client to share, let alone shorten it. Here's how I solved the problem, connecting Bit.ly, Twitter, and my iPhone so I can send the cool links I find while reading mobilly.
For those of you who don't know, Bit.ly is a NY-based and Betaworks-incubated URL shortening service. Because of it's rich click-through stats, it's simply a tool I could not live without (more on why tracking click-throughs in Twitter is important in a forthcoming blog post).
Add the bit.ly bookmarklet to Safari
Sync your Safari bookmarks with your iPhone (I use MobileMe so it does it automagically, but you can also do this manually on the "Info" tab in iTunes).
Go back to the page you want to share in your iPhone's browser.
Go into your bookmarks and click the "bit.ly" bookmark.
Congrats! You now have a shortened link.
Type your message, click Sign-in/Post (where you'll have to enter your Twitter credentials).
And there you have it! It's a great way to use bitly on your iPhone!