I've fork-ed the original repo and added a feature that I feel is useful for my current project and possibly in future projects. Just a personal preference. If you like it, get it here.
Features added on top:
Ability to populate the address bar when the marker is moved on the map
Ability to initialize with the address bar with default lat/lng
Auto-zoom in after an update on the position
jQuery UI widget for selecting an address. This widget has been develop for a specific need but feel free to use it or fork the repository
You can see a live demo here: xilinus.com/jquery-addresspicker/demos/index.html
Autocompletion is maiden with jquery-autcomplete widget and filled by google maps V3 geocoding suggests.
Instant display suggestion on a map