Our popular Las Vegas info site, RateVegas.com, has been around since 1999 and in that time has been implemented with PHP, Java Servlets, WebObjects and now Rails.
We launched version 4.0, the Rails based site, yesterday.
The Rails version has more features and less code than the WebObjects version and I anticipate it being a lot easier to maintain as well. Up to this point the site handles about 250k page views per day and I hope to ratchet that up with some new features.
For those interested, check it out:
Cheers, Hunter