Hey Muddy - One thing that I'd love to add is "site speed"<p>Just about the easiest thing in the world to do, that works virtually every time is to increase site speed by.<p>On average we see load speed for client LPs in the 2.5 - 4 second range.<p>Rule of thumb for us is that 1 second reduction = 10% bump in conversion.<p>Here's a primer of the top 3 things that we do to improve:<p>a) Minimizing HTTP requests in your header that could potentially slow down loading.<p>b) Batching style sheets so that they load in appropriate order - eg client visually sees important elements immediately like headline, text, button.<p>c) Get your heavy weight elements (scripts / images), if not the entire site, onto a Content Delivery Network.<p>More resources on site speed:<p>Google's Site Speed Tax:<p><a href="http://www.conversionvoodoo.com/blog/2010/04/official-google-news-low-website-speed-will-lower-you-page-rank-and-your-landing-page-conversions/" rel="nofollow">http://www.conversionvoodoo.com/blog/2010/04/official-google...</a><p>Walmart's Real Data on Transactions w/Site Speed:<p><a href="http://www.webperformancetoday.com/2012/02/28/4-awesome-slides-showing-how-page-speed-correlates-to-business-metrics-at-walmart-com/" rel="nofollow">http://www.webperformancetoday.com/2012/02/28/4-awesome-slid...</a><p>List of free & commercial CDNS:<p><a href="http://en.wikipedia.org/wiki/Content_delivery_network" rel="nofollow">http://en.wikipedia.org/wiki/Content_delivery_network</a>