[luigi]

One thing to make clear: simply using #! does not make your app crawlable. Your server-side app needs to also handle URLs that contain _escaped_fragment_, per Google's specification:

http://code.google.com/web/ajaxcrawling/docs/getting-started...

[afshin]

Yes, thanks for pointing that out. This is only one side of the coin. The other side is a server that will answer all of those requests.