Address Picker Plugin is autocomplete filled by google map geocoder suggestions. Also map displays selected address, even while you navigate in autocomplete suggestions. Lat and Lng fields are just for information. You can even adjust marker position on the map
doubleSuggest plugin will set up a UI that suggest results as you type.
It will display two types of suggestions, first (and faster) the local data and second (and slower) the results from an ajax search query.
TextExt is an autocomplete and tag input plugin for jQuery which allows you easily turn a standard HTML text input into a wide range of modern, tailored to your needs input field without bloating your source code and slowing down your site with the code that you aren’t using.