Video: CouchDB, MongoDB, RavenDB and SimpleDB Compared
www.readwriteweb.com/hack/2011/01/video-nosql-comparison.php
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Jesse Wolgamott presented at Lone Star Ruby Conference on four major NoSQL databases: CouchDB, MongoDB, RavenDB and SimpleDB. We've covered various comparisons before, such as one by Adrian Cockcroft. And of course there's our own article on the subject: "Is the Relational Database Doomed?" But if you'd rather kick back and watch a conference presentation, then this is for you. It has the benefit of including RavenDB in the comparison, which we haven't covered before.