Useful links for integrating Twitter with PHP.

http://spaceninja.com/2009/07/twitter-php-caching/

http://css-tricks.com/snippets/php/get-latest-twitter-status/

http://thinkvitamin.com/code/how-to-get-started-with-the-twitter-api/

http://blog.ninanet.com/2010/04/19/twitter-feed-with-php

http://sitearticles.com/code/php-tutorial-fetch-and-display-tweets/

http://snipplr.com/view/16221/get-twitter-tweets/

http://dev.twitter.com/pages/streaming_api_methods

http://www.acornartwork.com/blog/2010/04/12/tutorial-twitter-rss-feed-parser-in-pure-php/

http://woork.blogspot.in/2009/06/super-simple-way-to-work-with-twitter.html