Time zone field (tzfield) provides a CCK autocomplete or select field for storing time zones. It could be useful if, for example, you have a node type representing a location such as city, office, station, etc., and you wish to associate a time zone with these nodes. Time zone data is stored in the standard tz database format, e.g. Europe/London.
This module is still in development feature wise, but should be fully functional. Note,...
This module creates a new cck widget, for the textfield: Textfield with autocomplete. It uses Drupal's nifty autocomplete features. It looks through all current values that the field has taken, and offers them as choices.
This module adds settings to the taxonomy autocomplete. You can configure an autocomplete widget for a vocabulary to set its autocompletion by matching anything in the searched string or by matching the beginning of a searched string.