WMS:Assuming you are gonna use Google Maps proper, versus OpenLayers (which would make things easier), check out wms236.js for a simple javascript that makes it reasonably easy to take your WMS and overlay it in Google Maps. Note that either way, Google uses an 'odd' projection (http://spatialreference.org/ref/user/google-projection/) so your WMS should be output in that. However if you are just working with a localish area not near the poles, you can probably get away with EPSG:4326 for a reasonable close overlay.
I wrote some info up about these projections last year: http://cfis.savagexi.com/articles/2006/05/03/google-maps-deconstructed http://cfis.savagexi.com/articles/2006/06/30/mouse-coordinates-to-lat-long Charlie
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