Breaking the web with hash-bangs
For the time being, I will personally continue to build #!-only websites, designed exclusively for javascript enabled browsers. Maintaining two versions (along the guidelines of progressive enhancement) is just too much work (maintaining and testing html view templates as well as jQuery or moustache templates) considering that so few people lack javascript. I wouldn't let a release go live without running a selenium suite across it in any case.  My perspective would be different, I imagine, if I worked on a large team that could 'afford' to take the progressive enhancement route.