Hello, there are guys using Redis in production with 350 million keys for server (64 GB ram for server). Also there are several other startups using Redis in production. Of course I'm using it in production myself.

If you search 'redis' in search.twitter.com you can see a lot of guys hacking with Redis in paywork environments. We are ready to release Redis 1.0 stable, it'a a matter of one month now. Then we'll have two development trees, one stable and one instable.

To deliver a rock solid product is one of my top commitment with Redis.