Most anecdotes I have read online indicate that they work, sometimes as a short-term boost to sales, sometimes longer-term: http://www.wired.com/gadgetlab/2009

Most anecdotes I have read online indicate that they work, sometimes as a short-term boost to sales, sometimes longer-term: http://www.wired.com/gadgetlab/2009/02/shoot-is-iphone/ http://www.wired.com/gadgetlab/2009/02/shoot-is-iphone/ http://candycaneapps.wordpress.com/2008/12/09/the-insouts-of-life-in-the-appstore/ http://candycaneapps.wordpress.com/2008/12/09/the-insouts-of... http://www.streamingcolour.com/blog/2009/04/27/the-numbers-post-part-2/ http://www.streamingcolour.com/blog/2009/04/27/the-numbers-p... http://148apps.biz/app-sales-coorelation-between-demo-and-paid-versions/ http://148apps.biz/app-sales-coorelation-between-demo-and-pa... http://www.veiledgames.com/blog/?p=374 http://www.veiledgames.com/blog/?p=374 http://www.antairgames.com/blog/2009/02/02/hows-that-lite-version-treating-you/ http://www.antairgames.com/blog/2009/02/02/hows-that-lite-ve... As near as I can tell, a lite version is the most cost-effective form of marketing available, probably better than making a webpage for your app, or making a YouTube video of it, or getting your app reviewed on review site (all of which, I am told, are also very good things to do).