Javascript: Breaking the Web with hash-bangs
All non-browser user-agents (crawlers, aggregators, spiders, indexers) that completely support both HTTP/1.1 and the URL specification (RFC 2396, for example) cannot crawl any Lifehacker or Gawker content. Except Googlebot.
more on isolani.co.uk
Hashbang URL's (#!) are breaking the web. Recently Gawker Media websites (such as Gizmodo) joined Twitter in using them. The post provides good technical explanation why it's a short sighted and dangerous idea.