Start using distributed caching in your existing NHibernate based applications without any code change. Download NCache from http://www.alachisoft.com/rp.php?source=/caparea.news2/&dest=/download.html.

NHibernate only provides a stand-alone cache. However, if your .NET application is running in a server farm then your cache must be distributed in order to avoid data integrity problems in your cache.

NCache provides a second level or process level distributed cache for NHibernate by implementing ICacheProvider and ICache interfaces. You can plug-in NCache to your existing NHibernate application without any code change. Just change your "app.config" file to specify NCache as your "hibernate.cache.provider_class" and you're all set to start using distributed caching.

Read more about NCache
http://www.alachisoft.com/rp.php?source=/caparea.news2/&dest=/ncache/index.html