Ah, but the #! is probably just using JS to access a well-defined API - the same API which anyone else can access in completely uncluttered, machine-readable fo

Ah, but the #! is probably just using JS to access a well-defined API - the same API which anyone else can access in completely uncluttered, machine-readable form. So perhaps the solution is for every #! page to have a meta tag pointing to the canonical API resource which it is drawing data from. Bingo, semantic web!