Lets say I have a link:

<a href="/about/">About Us</a>

But in Javascript [or jQuery] catches it and then adds the hash based off of the href attribute:

$('a').click(function(e) {
    e.preventDefault();
    // Extremely oversimplified..
    window.location.hash = $(this).attr('href');
});

And then we use a hashchange event to do the general 'magic' of Ajax requests. This allows for the actual href to be seen by crawlers, but gives client-side users with JS enabled an ajax-based website.

Does this 'help' the general SEO issues that come along with hashtags? I know hashbangs are 'ok', but afaik they aren't reliable?