I'm working on Redis adapter for DynamoDB - Dynamo is really a distributed superset of Redis, and most of the data structures that Redis has scale effectively to the distributed hash table + B-Tree-like system that Dynamo offers. Having a well known and understood API like Redis is a boon for Dynamo, whose API is much more low level and esoteric.
The Go library is in beta, working on a server that's wire compatible with Redis.