I am not sure which technology you've used to develop your site, but Project Aura being developed by Sun developers looks really promising and is open source. Here is a link to their PDF from this year's JavaOne, they are suppose to launch it within the next month. http://developers.sun.com/learning/javaoneonline/2008/pdf/TS...
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Collective Intelligence book has some examples - http://www.amazon.com/Programming-Collective-Intelligence-Bu...
I am not sure which technology you've used to develop your site, but Project Aura being developed by Sun developers looks really promising and is open source. Here is a link to their PDF from this year's JavaOne, they are suppose to launch it within the next month. http://developers.sun.com/learning/javaoneonline/2008/pdf/TS...