I am doing some ajax page with jQuery, can you tell me which are the differences (especially for SEO point of view) between pages like:
Edit: mh maybe the second options is google-friendly
Thanks
You should use #! if you want your site crawlable by Google. More information is found on their Getting Started guide. So yes, the second version is more SEO-friendly. Another post worth reading is Googles propsal for making ajax pages crawlable.
However, for a users point of view, there's no difference.
Just a tip, sammy.js is a great library for working with this. It allows you to define routes using hash fragments.