I'm getting some pretty severe "seams", bezels, what have you between tiles 
layering on top of Google at what I thought were reasonable zoom levels.  Is 
there some magic I should know about when creating WMS layers or the Google map 
base layer itself?

This is my code:

// the map
BB.map = new OpenLayers.Map( 'map', {
            projection: new OpenLayers.Projection("EPSG:900913"),
            displayProjection: new OpenLayers.Projection("EPSG:4326"),
            units: 'm',
            numZoomLevels: 18,
            maxResolution: 156543.0339,
            maxExtent: new OpenLayers.Bounds(-20037508, -20037508, 20037508, 
20037508.34)
        });

BB.base_layer = new OpenLayers.Layer.Google( 'Google Streets' );
BB.map.addLayer(base_layer);


// for the WMS
this.openlayer = new OpenLayers.Layer.WMS(this.layer, this.url, 
                        { srs: BB.map.getProjection(), 
                          layers: this.layer,
                          transparent: true
                        }, 
                        { isBaseLayer : false, 
                          sphericalMercator: true 
                        }
                    );

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