Redis

Redis is an open-source, networked, in-memory, key-value data store with optional durability, written in ANSI C.

General

 * Official site (see esp. Introduction to Redis)
 * The Redis article on the English Wikipedia.
 * Redis/INCR
 * Getting to Know Redis (PDF)
 * Redis, from the Ground Up
 * Redis and Relational Data
 * Redis Cookbook (book; not great, but see ch. "Analytics and Time-Based Data")
 * Interview with Salvatore Sanfilippo (code-oriented but still useful)
 * Redis DB (Google Group)

Analytics

 * Redis at Disqus (their entire analytics platform runs on Redis)
 * Effective Web App Analytics with Redis
 * How YouPorn uses Redis (video)
 * Realtime metrics using Redis bitmaps

Tooling

 * redis-py is the library of choice for Python
 * Getting Started: Redis and Python
 * Redis and Python (presentation slides)
 * Resque for jobs
 * Redisco, a Python ORM for Redis
 * py-analytics (I haven't used this)

Informed Opinions

 * Antirez: You Need To Think In Terms Of Organizing Your Data For Fetching

Miscellaneous

 * Storing hundreds of millions of simple key-value pairs (how Instagram uses Redis)