I read much about site-wide links being really bad for seo - but you know what i have seen many sites still benefit from this technique. Think about it logically a site-wide links is natural isn't it? i mean when people link to others they might just throw you in a footer or site-wide link - especially if you are an authority in that niche - therefore is it fair for sites to be penalised? Perhaps it's only bad for seo when you have too many site-wide referring domains?