Twitter API Tools

I found a great website that lists 50 different applications using the twitter api. It includes links to each application and includes a tutorial on how to code it.
http://www.smashingmagazine.com/2009/03/02/twitter-web-designer-and-developer-toolbox-api-and-tutorials/

Here is a tutorial on how to make your own website display your twitter updates. This enables you complete control over the look and feel of you website. This would be nice to use if you did not want the twitter feed to stick out like a sore thumb on your otherwise custom page.
http://tutorialblog.org/how-to-make-a-unique-website-for-your-twitter-updates/

Here is a tutorial on how to display two different twitter feeds on the same page. This would be nice to use on a website where you collaborate with someone else.
http://tutorialblog.org/how-to-make-a-unique-website-for-your-twitter-updates/

This guy came up with a solution for publishing events to his google calendar using sms messages. How does this relate to twitter? Well he used the twitter api to recieve his sms messages and then used a php script to make some changes and then used the google calendar api to record the event. This would be nice to use since I do not have a smart phone to log in to google calendar from anywhere.
http://dotjay.co.uk/2008/feb/php-twitter-google-calendar-sms

Steve Reynolds has posted a nice tutorial on accessing the twitter search API. This allows your website to search twitter automatically for predefineded search criteria. That way you can display what other people are saying about you or your products.
http://www.reynoldsftw.com/2009/02/using-jquery-php-ajax-with-the-twitter-api/