Alex Iskold just posted Rethinking Recommendation Engines, a product type that we here at ReadWriteWeb have explored a lot over the past year or so. In this follow-up post, we present 10 recommendation engines that we like. And we don't include the obvious ones, such as Amazon, Netflix, last.fm, Pandora. So it's not a 'top 10', don't panic. We invite you to add your favorites in the comments.

Recommendation engines were included in our toolkit for 2008: What's Next on the Web. Marshall Kirkpatrick wrote that "the future is likely to be even more swamped in data, social and content options than the web is today. From Google Reader's recent incorporation of both feed recommendations and shared items in Reader from your contacts in GMail to the ascendancy of services like Last.fm, Pandora and StumbleUpon - recommendation is beginning to make a big splash already."