Have you checked the maemo.org bugzilla lately? Lots of 'feedback' there from the Summit 300. That 'introverted' and public feedback will give you all a much better release version of Maemo 5, and top notch apps in Extras.

Peter specifically said in Amsterdam that there was no NDA... feel free to ask questions if you want.

Edit: The pre release Maemo 5 we have does not feel Beta at all. There are some bugs, yes. But overall, the OS is top notch. And really, what hasn't been covered on youtube already?