I just discovered that google adword does not allow the hash bang (#) in the destination url of Adword Ads. If the url contains # then u can't advertise ur page in Google.
So we need a way to hide the hash bang (#) in the url but still be able to let the the spider to know that our app is the Ajax-based app.
So what is the best (ie simple but very effective) solution to solve this issue?
You can use a redirect: Google Groups for instance uses redirects for its "permalinks"; e.g. https://groups.google.com/d/forum/google-web-toolkit redirects to https://groups.google.com/forum/#!forum/google-web-toolkit