jQuery Autocomplete Plugin

jQuery doesn't ship with an auto complete UI component. I found a very nice, and very very very very flexible jQuery Plugin doing this job named Autocomplete. It supports static and dynamic data and cause of its event model it's very flexible. For instance it's no problem to have a autocomplete text field for a ZIP code which automatically fills in an additional city field. It also has formatters which can be used to format the proposals - eg. the ZIP field fills in ZIP codes but provides ZIP - CITY as proposal.