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Stuff that everybody that builds web sites should know but maybe doesn't:

1. Gzip your transfers to make everything faster
   (http://betterexplained.com/articles/how-to-optimize-your-site-with-gzip-compression/)

2. Host your images, javascript & css separately on fake subdomains, using .htaccess to redirect all requests for www.domain.com/images/name.jpg to i.domain.com/images/name.jpg (for example).