You can get them as raster via WMS (if you have a web map service...), or as
vector features via OpenLayers.Layer.Vector or OpenLayers.Layer.WFS.

I used to get the PNG raster of my shapefile like this (I have GeoServer as
WMS):

                var myShapeFile = new OpenLayers.Layer.WMS('Name',
                                WMSURL, 
                                {layers: WORKSPACE + ':' + ,
                                transparent: 'true', // Visualize all rasters 
at the same time
                                opaque: 1,
                                format: 'image/png8'},
                                {opacity: 0.4, singleTile: true, 
transitionEffect: 'resize'}
                        );

                OLmap.addLayer(myShapeFile);

Take a look at the examples code, it may be useful (e.g.
http://openlayers.org/dev/examples/wfs-protocol-transactions.html)
Piero
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