Forgot to mention until now the latest updates from Redis. Most of them (pattern matching Pub/Sub, Hashes, protocol changes, etc.) are related to the Redis roadmap to 2.0. I enjoyed reading about non blocking rehashing implementation.
As a side note, I still find the
PUB/SUB feature a bit weird and disconnected from Redis main functionality. I could see it though as an independent sub-product relying on Redis.