Where can I find a good JavaScript/HTML AutoSuggest example

I am looking for a good example implementation of a JavaScript/HTML AutoSuggest input box to get me started. What I am trying to implement will behave "Exactly" like the Tags input box here on stackoverflow.

If it helps I am using jQuery to perform Ajax request.

I am finding examples to help me implement this however I am concerned what about best practices in the area and would love to get opinions also.

From stackoverflow

• Er, jQuery Autocomplete? And another example.

  Jamey McElveen : I am gonna go with jQuery Autocomplete

• Antonio Lupetti has just posted a review of Javascript based auto suggest scripts in his article Useful Ajax Auto Suggest scripts collection.

  You might find some interesting links there?

• Try the YUI Auto complete. Works great!! http://developer.yahoo.com/yui/autocomplete/

• I used brandspankingnew's AutoSuggest (and happy of it) -> http://www.brandspankingnew.net