First little project

[eluser]Unknown[/eluser]
Codeigniter is awesome, best PHP framework ever,
Just spent some time last night to create an instant domain search engine with AJAX and Codeigniter. The performance is pretty good better than what I expected.

www.domainstant.com

Give me some suggestions for Improvement, I am going to release a free API for using my service, anyone interested to it

p.s. What is the best way to implement AJAX in Codeigniter ? any good library recommend?