Respectfully, it's posts like this that are keeping me from investigating the new k-v stores for our (large) Rails app. I don't want "awesome", I don't want a "lifestyle", and I'm certainly not motivated by the idea of replacing something that is fast enough, but not as fast as it could be.<p>You've got every right not to care what I think of Redis (or Couch or whatever), but if you do and you're wondering how to address people like me --- ie, people who would rather add one more tiny feature to a product that sells than talk about NoSQL --- can you tell me how Redis fits in alongside a MySQL/AR setup? If I'm already committed to AR, where does Redis (or Couch or whatever) make my existing app better?