As I mentioned in a comment above, the AppFabric Cache is now live, in production. Details, including pricing and SLA, are here. Highlights of the production release:
- Availability in all data centers
- Ability to consume cache from 128MB to 4GB
- Transactional SLA (# of cache transactions per second)
Through the portal, once you create your cache namespace, you simply click a button that generates web.config/app.config snippets that you copy 'n' paste. It's that simple.