Some sample CodeIgniter applications:
http://www.zenperfect.com/2007/07/27/sample-codeigniter-application/
http://video.derekallard.com/video/
(AJAX , Script.aculou.s)
Using Zend Framework components in CodeIgniter
http://www.4webby.com/freakauth/tutorials/using-zend-framework-components-in-code-igniter
Kenjun 
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