A newly released site developed entirely in Rails, known as Smatchy (<a href="www.smatchy.com">www.smatchy.com</a>), presents an interesting take on recommendations and could become the standard rather than the exception. The recommendations were more useful than typical sites, especially the 'Unique Recs.'
<a href="http://www.adamhegedus.com/2006/11/16/everyone-knows-the-letdown-of-a-bad-recommendation...">More Info here...</a>
<a href="http://digg.com/tech_news/Website_figures_out_who_is_like_you_and_who_is_not">Digg it!</a>