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Web 2.0 is all about a user-centric, personalised model. In other words, "the user is in control". That's why recommendation engines are so exciting - they're going to form the backbone of this user-centric ecosystem. Josh Porter has a great roundup of these engines, including:
* iTunes “Top Songs”
* Amazon “people who bought this also bought…”
* Bloglines “similar blogs”
* Del.icio.us “most popular” bookmarks
* NYTimes “most emailed articles”
Josh is a not only a great blogger - he's also a bit of a visionary. Subscribed!