well - another mercator, very easy, fast and just not that perfect

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It?s some Filter-action..
1. filter -> render black and white clouds.
2. filter -> pixelate -> mosaic : 15-25
Filter->Blur->Radial blur: Amount 20, zoom, best (if ur comp can handle best, if not use draft)
3. filter -> brush strokes -> Accented Edges, width 2, brightness 35, smoothness 4.
4. stylize -> find edges
5. invert (ctrl and I)
6. adjust hue/sat (ctrl and u) to change the colours.
Well I have PS in german so I don?t really know if that?s all right. Anyway, now you should have some nice and fuzzy gridlines..
Then filter -> "Distort/Spherize...". and try some steps of the Mercator Tutorial..
greetz, nerinho