Google maps projections..

[Dave Brown]

Could any one help me setting the correct parameters for overlaying my
vector maps (latlong wgs84) over google maps imagery ?
 
I have the right bounds etc.. and when I dont specify the projections at
all, the correct data is overlayed but the projection is off.. 
 
I am experimenting with mapserver as I want to move away from mapxtreme,
which in mapxtreme I used to render the map in mercator projection/Nad27 but
whatever I seem to do in mapserver, I get incorrect results..
 
I using OGRINFO on one of my MI .TAB files the projection info is...
 
GEOGCS["unnamed",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563],
        TOWGS84[0,0,0,0,0,0,0]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433]]

 
Any help greatly appreciated. 
 
Thanks,

Dave.

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