Something that seems to be absent from the otherwise great new features for Windows Azure (announced on June 7th), is the ability to define distributed caches for the reserv
You sure can create Dedicated Cache for windows Azure websites in reserved mode. As of now you may not be able to find how to create it in Windows Azure June SDK (1.7) however if really want to do it you need to accomplish it manually.
I had some discussion around this and after some digging I found that it can be done by understanding the dedicated cache in Windows Azure Web Role first and the migrating the references & configuration to your ASP.NET Website. Here are some steps you can follow to try it by yourself: