Perhaps this is too obvious to state, but progressive enhancement obviates most of this. Any linkable state (that someone might plausibly want to link to), shou

Perhaps this is too obvious to state, but progressive enhancement obviates most of this. Any linkable state (that someone might plausibly want to link to), should be addressable via a regular old URL. Add a layer of JS to intercept clicks and serve ajax content, with the state expressed in the hash. The hash should look suspiciously like the fragment that non-ajax agents would see. I say this not as a dogmatic should, but because I find separating concerns makes it easier to develop, and preserves web-ness. Ajax is an enhancement, not an architecture.