Is there a rich preview for URLs JQuery plugin out there?

I am developing a social link aggregator application and need a JQuery plug in which can inspect URLs and produce preview elements for them. You obviously need server side magic to get snapshots of web pages but it is possible to do stuff like converting a Youtube URL to the respective flash embed on the client side. Or getting the image from an Instagram page and such...

Before I dive into implementing this, is there something out there that already does this?