Beta means it is being tested and is not a finished, polished, "public-release" product. You can certainly request to be allowed to download it and take part in the beta test. I think there is a customer code like "crackberry" that will allow you to download it.
The 0.94 Bolt beta browser does a pretty decent job with facebook and mafia wars, although it is a major battery drain. I do not know if that is due to facebook/mafia or Bolt, as I hardly use Bolt outside of mafia wars.
There are a few issues clicking some of the boxes, but well worth the price ($free) ....
Here is a question for developers...Would there be a way to make an application that we could access faceBooks Mafia Wars from? Kind of like we can use tinytwitter to access our twitter information?