As bMarkowe/b says above, the SEO question seems a little harder to answer, but my best guess is that Google, Yahoo and MSN probably have some pretty smart algorithms that know that the words 'color' and 'colour' are the same. b...../b usage ( holiday means bvacation/b in Br E and ). grammar (group is used with plural verb in Br E, singular in Am E). spelling (travelling Br E; traveling Am E). Don't mix those two styles - pick one and make the web more comprehensible. ...
