I have released the version 1.3 of ItsNat , Natural AJAX.
ItsNat is a LGPL licensed AJAX framework aimed at developing applications and websites Single Page Interface SEO compatible, within the philosophy of the Single Page Interface Manifesto
Although memory optimizations on the server (caching of static instantiated not as DOM, possibility of eliminating subtrees that are no longer going to be uses etc) normal mode requires server memory associated with the user's page, this implies sticky sessions (server affinity) to drive user requests always to the same server lead, also session sharing is supported in this case page state is saved in session and shared between nodes with some transport cost added.
Stateful or stateless operation has little relation to the support of SEO by ItsNat, because SEO support has more to do with fast-load mode, so then this new stateless mode also allows the development of web sites SEO compatible.
The ultimate goal is to facilitate the development of websites SEO Single Page Interface compatible stateless server centric with the power of Java, W3C DOM APIs and pure HTML templates.