andrei-kom, как именно они выбирают? Через Local Search, через Google Search, через собственный Control в виде строки для поиска?

andrei-kom, при инициализации проставь callback'и на нужные эвенты http://code.google.com/intl/en/apis/maps/documentation/reference.html#GGoogleBarOptions onGenerateMarkerHtmlCallback Function This property lets you specify a callback function to be invoked when the info window for a search result marker is opened. The function should be passed a GMarker, generated HTML string, and GlocalSearchResult (in that order) and must return the modified HTML string to be displayed in the info window.

onMarkersSetCallback Function This property lets you specify a callback function to be invoked when the GGoogleBar completes creation of its markers and places them on the map. This function must be passed an array of objects of the form {result: GlocalSearch, marker: GMarker}.