I'm looking to build an application similar to this ArcGIS Server JS example which does a find task against a layer in the map. However i want to do this with OpenLayers, Geoserver and PostGIS. Some pointers would be great.
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you can do this with OpenLayers, Geoserver and PostGIS and Geodjango too. There is a tutorial here. if you desing a good database with logical index, you can get search tool as google map.
i hope it helps you.