Just last week it was announced that Windows Azure AppFabric Cache is now in production. That is great news for folks who are looking to add some caching to their Azure apps. The only thing I read that concerned me was the pricing. It starts out at $45 for a small 128 MB cache and goes all the way up to $325 for 4 GB. After reading the FAQ, you’ll see that there are limits to the amount of transactions, bandwidth, and concurrent connections as well at the different sizes. Once I read the FAQ though, I can see where this is an excellent value if you’re not wanting to invest in your own equipment to run and properly size your own local Windows AppFabric Cache instance. I will have to do some further research, but I imagine that the hardware requirements to be able to do the amount of transactions and bandwidth at the upper limit of the 4 GB plan would be pretty expensive. In any case, Microsoft will not start charging for this service until August 1st, 2011. If you are thinking about getting started with Azure AppFabric Caching, you can sign up for a free trial introductory offer.